four-dimensional system

- acoustic alarm system
- acoustic image system
- acoustic systems
- actiontrack system
- active IR-system
- actuator system
- adaptive communication system
- adaptive teleinformation system
- adaptive telemetering system
- advanced information system
- Afsatcom system
- air system
- aircraft intercommunication system
- airfield communication system
- air-ground automatic system
- airline reservation system
- air-to-ground TV system
- alarm signal system
- alarm system
- all-channel signaling system
- ALL-IN-ONE system
- alphanumeric system
- amplified speaker system
- amplitude shift-keying system
- AMPS system
- analog cellular communication system
- analog cellular system
- analog component video system
- analog television system
- analog tropospheric system
- anisochronous system
- antenna system
- antitheft system
- AR system
- Arabsat system
- ASK system
- associated channel analog system
- asynchronous address communication system
- audio recording system
- Aurora system
- Aussat system
- automatic communication system
- automatic connection establishment system
- automatic control system
- automatic data acquisition system
- automatic telegraphy system
- automatic telephone system
- automatic tuning system
- automatized cellular system
- auxiliary alarm system
- balanced cable transmission system
- band sharing system
- base station system
- baseband system
- basic input/output system
- bass-reflex speaker system
- batch processing system
- batch transmission system
- batch-and-forward system
- batteryless system
- bilateral CTV system
- binary tariff system
- biocontrol system
- bit parallel interface system
- bit transport system
- bridge duplex system
- broadband mobile system
- broadcast satellite system
- broadcasting delivery media systems
- burglar alarm system
- byte-serial interface system
- cabinet system
- cabinetless system
- cable distribution system
- cable TV system
- call-accounting system
- call-answering system
- call-counting system
- call-distributing system
- call-processing system
- call-queueing system
- camp-on system
- CAPTAIN system
- car component audio system
- carrier reinsertion system
- carrier system
- carrier-communication system
- carrier-current communication system
- Cassegrain-Schmidt system
- cassette recording system
- cassette reproducing system
- CATRIN system
- caution system
- CD 900 system
- cellular system
- cellular-radio system
- central-battery system
- centralized control system
- chirp binary telegraph system
- cipher system
- circuit switched telecommunication system
- circuit switching telecommunication system
- circular telecontrol system
- clock system
- closed-circuit communication system
- closed-circuit telegraph system
- closed-numbering system
- code-dependent system
- code-division multiple access system
- code-independent system
- code-insensitive system
- code-sensitive system
- coding system
- coherent fiber-optic system
- collimating system
- collocated system
- color separating system
- combined numbering system
- combined power supply system
- combined satellite communication system
- common-battery system
- common-carrier system
- common-channel signaling system
- common-engineering communication system
- common-purpose cellular system
- common-using band system
- common-using cordless telephone system
- common-using paging system
- communication system
- communication traffic system
- communications system
- community antenna system
- community antenna television system
- community TV-system
- commununication switching system
- compact disk digital audio system
- compatible color television system
- compatible single sideband system
- compatible single-band system
- compatible TV-system
- complex radio communication system
- computer vision system
- computer-telephone system
- Comsar system
- Comsat system
- Conax system
- concentrated-insonation system
- conference system
- conference-communication system
- congested system
- congress-class system
- constant-current system
- control generating system
- conventional television system
- Conversant system
- cordless-communication system
- crossbar system
- crossed-coincident microphone system
- Crosspoint system
- CSE system
- C-system
- cubical video projecting system
- data processing system
- data system
- data transport system
- data-collection system
- data-compression system
- data-exchange system
- dataflow system
- data-gathering system
- data-handling system
- data-measuring system
- data-reduction system
- data-transmission system
- Decca Navigator system
- DECfax system
- decision-feedback system
- dedicated control channel system
- dedicated multimedia system
- delta-sigma system
- deluxe presentation system
- departmental communication system
- desktop-video system
- DFS/Copernicus system
- dial-telephone system
- differential phase shift-keying system
- differential-duplex system
- differential-magnetic system
- digital camera system
- digital hybrid-key telephone system
- digital mass storage system
- digital microwave radio transmission system
- digital telephone communication system
- digital transmission system
- digital TV-communication system
- Digital UNIX system
- digital-analog system
- digital-cellular system
- digital-data modulation system
- digital-effect system
- digital-message entry system
- digital-termination system
- direct-broadcasting satellite system
- directing system
- direct-modulation system
- direct-sequence system
- direct-telephone communication system
- discrete communication system
- discrete sound system
- discrete-addressing system
- disk-operating system
- DISOSS system
- dispatch telephone communication system
- dispatch-center system
- dispersed-insonation system
- distributed-insonation system
- distributed-processing system
- documental-type communication system
- Dolby systems
- domestic satellite communication system
- double-band telephone communication system
- double-channel transmission system
- double-current transmission system
- double-pole communication system
- double-sideband large carrier system
- DSCS system
- D-system
- dual-cable system
- dual-reflector system
- duplexed system
- Earth-to-space transmission system
- ECM system
- electric communication system
- electronic antishock system
- electronic data-gathering system
- electronic data-processing system
- electronic-message system
- electronic-scanning system
- electronic-switching system
- Ellipso system
- emergency telephone communication system
- emergency-broadcast system
- EMX system
- equidistant system
- error-correction system
- error-detection system
- Eutelsat system
- extensible system
- external paging system
- facsimile system
- fast-acting servicing system
- fault-tolerant system
- fax communication system
- fax transmitting system
- feed system
- fiber transmission system
- fiber-optic transmission system
- field-sequential system
- final mile system
- finishing system
- fire alarm system
- fire warning system
- first generation cellular system
- five-channel communication system
- fixed satellite system
- Flexcam system
- flexible access system
- Flitsatcom system
- focusing system
- four-channel sound system
- four-dimensional system
- four-wire telephone communication system
- frame-sequential system
- frequency shift-keying system
- frequency-carrier system
- frequency-control system
- front-bass reflex speaker system
- fully digital system
- gate system
- Gaussian system
- generalized system
- generating dynamic system
- generator-dc-motor system
- GIGASET radio system
- global positioning system
- Global system
- Gopher system
- grandfathered system
- group-alerting and dispatching system
- guide system
- hard-wired CCTV system
- hazard system
- helical-scan system
- HF-synchronizing system
- high-precision navigating system
- Hi-linear system
- home system
- home-telephone system
- home-type system
- homing-guidance system
- host system
- hydroacoustic system
- ideal communication system
- idealized system
- image informaion system
- image-forming system
- immedial servicing system
- incompatible system
- independent system
- information retrieval system
- information system radio system
- information system
- information-feedback system
- information-measuring system
- infrared alarm system
- Inmarsat system
- Inmarsat-A system
- Inmarsat-B system
- Inmarsat-C system
- Inmarsat-D system
- Inmarsat-M system
- Inmarsat-P system
- integrated telephone system
- integrated videographic teleconferencing system
- integrated-antenna system
- integrated-communication system
- integrated-modulation system
- integrated-office system
- Intelsat system
- interactive system
- intercarrier-sound system
- intercommunication system
- intercontinental tropospheric system
- interlock system
- intermachine exchange system
- intermediate system
- international communication system
- interphone system
- Intervision system
- intraband signaling system
- intruder alarm system
- inward-outward dialing system
- ionoscatter system
- ionosphere sounder system
- ionospheric system
- Iridium system
- isolated system
- Italsat system
- J-carrier system
- joint-multichannel trunking and switching system
- K-carrier system
- key system
- key-telephone system
- land satellite communication system
- large-grained communication system
- laser communication system
- L-band satellite system
- L-carrier system
- Leasat system
- lightning protection system
- limited distortion system
- line amplifiers system
- link system
- little-channel relay system
- local alarm system
- local battery system
- local communication system
- local radio paging system
- long-haul system
- long-range system
- loop system
- loud-speaking communication system
- low-traffic system
- magnetic tape recording system
- Mail system
- management-information system
- manual cellular system system
- manual telephone set system
- Marisat system
- master television system
- master-antenna television system
- matrix sound system
- message feedback system
- message procession system
- message registration system
- message-switched system
- meteor radio system
- Metrobus system
- micro component system
- Micro Press Cluster Printing system
- micro-lens system
- microprocessor system
- microwave relay system
- midi system
- mine radio telephone system
- mini system
- mixed media system
- mixed numbering system
- mobile cellular communication system
- mobile land communication system
- mobile radio system
- mobile relay system
- mobile system
- modulated system
- monetary mobile system
- MS-Mail system
- multiareal system
- multicassette system
- multichannel telephone system
- multicomputer system
- multidisk system
- multiformat recording system
- multifrequency tone signaling system
- multiguard system
- multilevel mixed system
- multimedia system
- multiple-channel system
- multiqueue system
- Multiscrypt system
- multistandard system
- multitrack editing system
- mutibeam antenna system
- muting system
- Nagravision system
- NAMTS system
- narrow-angle TV system
- national communication system
- navigation system
- n-channel communication system
- n-channel DPSK system
- n-channel transmission system
- network standalone system
- network system
- network-operation system
- networks numbering system
- neutral direct-current telegraph system
- n-head video system
- NMT system
- noise-reduction system
- nonhoming tuning system
- noninterlaced television system
- nonsegmented system
- Norsat system
- n-satellite system system
- n-tone DPSK system
- n-tone MFSK system
- NTSC system
- NTT system
- obligatory message system
- Odyssey system
- off-line system
- on-line computer system
- on-line secured system
- open numbering system
- open system
- operative-engineering communication system
- opposite signals system
- optical-communication system
- optical-information system
- optical-projection system
- optoelectronic system
- oscillating system
- oscillation system
- outband signaling system
- package-and-resource tracking system
- pagemaster system
- paging system
- PAL system
- parametric system
- PATHWORKS system
- pattern recognition system
- personal holding guard system
- phase shift-keying system
- phone system
- Piccolo system
- pilot-controller system
- polar direct-current telegraph system
- portable mobile system
- power control system
- power controlling system
- power-line carrier system
- power-supply system
- press-to-talk system
- Prestel system
- primary-supply system
- privacy system
- private branch paging system
- private movable system
- private videodata system
- private videotex system
- process-interface system
- PROFS system
- programmable cross-connect system
- programmable cross-connected system
- programmed radio system
- prompting system
- protected wireline distribution system
- protection system
- pseudoquadraphony system
- pseudotrunking system
- public videodata system
- public videotex system
- pulse-code system
- pulse-frequency system
- pulse-time system
- quadraphonic sound system
- quadruple-diversity system
- R1 system
- R2 system
- radio buoy system
- radio command system
- radio communication system
- Radio Data system
- radio facsimile system
- Radiocom 2000 system
- radio-control system
- radio-paging system
- radio-relay system
- radiosonde-radio-wind system
- radio-telemetering system
- real time pulse-echo system
- real time system
- receiver lockout system
- recording system
- recovery system
- redundant system
- reference-information system
- regional electronic payment system
- relay-radio system
- remote concentrating system
- remote control system
- remote diagnostic system
- remote information system
- remote semiconcentrating system
- remote sensing system
- remote signaling system
- rendering system
- rerecording system
- reserved servicing system
- RF/Transmission system
- rotary system
- safety alarm system
- safety system
- Satcom system
- satellite comminication system
- satellite marine comminication system
- Satellite Master Antenna Television system
- satellite radio system
- satellite-aircraft communication system
- SB-communication system
- SBL communication system
- scalable system
- scanning trunking system
- SCO UNIX system
- searchless identification system
- seat reservation system
- SECAM system
- second generation cellular system
- second room system
- secondary supply system
- secrecy system
- section communication system
- security system
- segmented system
- seismic system
- selective calling system
- selective frequency base station system
- selective protective system
- selective telephone system
- self-adjusting system
- self-balancing differential system
- self-contained system
- self-test system
- selsyn system
- semiautomatic-switching system
- semiautomatized cellular system
- sensory system
- servo system
- shadow-batch system
- short-haul microwave system
- Sicral system
- Sigma Servo system
- signal system
- simplex movable system
- single-band transmission system
- single-busbar system
- single-cable communication system
- single-cable system
- single-channel system
- single-current transmission system
- single-pulse tracking system
- Skynet system
- small-grained communication system
- SmarTrunk II radio communication system
- solid-state uninterruptible power battery system
- Sony bus system
- sound alarm system
- sound equalization system
- sound navigation system
- sound reinforcement system
- sound warning system
- space-division system
- space-switched system
- spark-safe system
- speaker system
- special communication system
- speech-processing system
- speech-recognition system
- split-speaker system
- spread-spectrum system
- stabilizing system
- stage monitoring system
- standalone double point system
- star-circuit system
- STAREX CMX system
- starting communication system
- start-stop system
- stationary satellite system
- step-by-step system
- stereo sound system
- stereophonic sound system
- storage system
- storage-and-retrieval system
- Strowger system
- submarine fiber-optic system
- subprimary digital transmission system
- subscriber carrier system
- subscriber switching system
- suffix system
- Supersat system
- supervisory control system
- surround sound system
- switched telecommunication system
- switching system
- sync communication system
- synchro system
- synchronous communication system
- synchronous digital system
- TAGS system
- tandem system
- tariffication system
- T-carrier system
- TDF system
- teleautomatic system
- Telecom system
- telecommunication system
- telecommunications system
- telecommunication-service priority system
- telecommunications-service priority system
- telecontrol system
- telemechanic system
- telemetering system
- telemetry system
- telephone system
- telephone-answering system
- telephone-communication system
- telephone-communications system
- teleprocessing system
- Telesat system
- teletex system
- teletypewriter system
- television-telephone system
- Tele-X system
- Telsar system
- terminal system
- terrestrial radio-relay system
- theft-prevention system
- thin-route system
- third generation communication system
- three-axle stabilizing system
- three-channel HF-telephone system
- three-channel transmission system
- three-color system
- three-lens optical system
- three-primary system
- three-wire system
- time-dissemination system
- time-frequency hopping system
- time-switched system
- total access communication system
- total area coverage system
- transmission system
- trichromatic system
- triple-interlace system
- triplex system
- trunk communication system
- TV-observation system
- twelve-channel transmission system
- two-arm system
- two-band system
- two-color system
- two-roller transfer system
- two-step control system
- two-way CATV system
- two-way system
- two-wire telephone communication system
- ultra-match system
- ULTRIX system
- unified radioaccess system
- unilateral-control system
- unilateral-synchronization system
- uninterruptible-power system
- Unisat system
- universal alarm system
- universal-battery system
- universal-electronic system
- universal-movable system
- Uniworks system
- vestigial-sideband system
- video editing system
- video home system
- video recording system
- videocom system
- videoteleconference system
- videotex system
- virtual studio system
- vision system
- vocoder system
- voice dialog system
- voice frequency carrier telegraph system
- voice modulation system
- voice post system
- volume control system
- waiting system
- warning system
- watch system
- watching system
- waterside facsimile communication system
- wave-propagating system
- wide-angle TV system
- Winfax Pro system
- wired broadcasting system
- wireless CCTV system
- wireless home system
- wireless infrared speaker system
- wire-radio communication system
- XY system
- zone-selective protection system
- zoning system

- four-ball machine - four-ball tester - four-bar linkage - four-bar mechanism - four-bar motion - four-barrel carburetor - four-barrel engine - four-bearing - four-bladed fan - four-bolt joint - four-boss breaker cam - four-bottle runner - four by four - four-by-four vehicle - four-by-two vehicle - four-car articulated set - four-chamber - four-channel antilock brake system - four corners - four-crank press - four-cycle - four-cycle diesel engine - four-dimensional interval - four-dimensional momentum - four-door - four-engined - four face column - four-foot way - four-high - four-jaw chuck - four-jawed - four-jawed chuck - four-jet turbine - four-lane - four-lane highway - four-lane road - four-layer - four layers hose - four-leg crossroads - four-leg junction - four-leg sling - four-legged intersection - four-level - four-part alloy - four-piece rim - four-piece wheel - four-pin driven nut - four-pin plug - four piston calliper disk brake - four piston disk brake caliper - four-pocket hydrostatic bearing - four-point - four-point ball contact in roller bearing - four-point bend - four-point bending - four-point control method - four-point loading - four-point probe - four-point suspension press - four-point press - four-pole - four-port valve - four quadrant detector - four quadrant operation - four-range - four-recess hydrostatic bearing - four-roll bending machine - four-roll forming machine - four-row - four-rowed - four-seater - four-sheave crownblock - four-sheave traveling block - four-sided trunnion fixture - four-speed - four-square scraper - four square setup - four-stage - four-stage blower - four-stage compressor - four-stage supercharger - four-start worm - four-strand chain - four-stroke - four-stroke cycle - four-stroke-cycle diesel - four-stroke diesel - four stroke engine - four-support cross-bar - four-throw crankshaft - four tube core - four unit sliding door - four velocity - four-way - four-way control valve - four-way directional control valve - four-way power seat - four-way socket wrench - four-way valve - four-wheel - four-wheel drive transmission - four-wheel drive truck - four-wheel drive vehicle - four-wheel steering - four-wheel truck - four-wheeled - four-wheeled wagon - four-wheeler - four-wire cable

- system of catalogs - system of catalogues - system of forces - system of ground points - system of road signs - system of scaffolds - acoustic signalling system - active residential solar heating system - aeration system - air-brake system - air-comfort system - air-conditioning system - air-curtain system - air-foam system - airline system - airline vacuum system - air-pressure water system - all-outside air-conditioning system - arch system - arch-and-pier system - audible alarm system - Automated Data Management System in Building - ADMSB - automatic fire alarm system - balanced system of ventilation - bar system - basic system - beam system - blower system - British absolute system of units - building system - building central air conditioning system - building solar optical system - bypass pipe system - cable system - cantilever tieback system - cathodic protection system of pipelines - central fan electric heating system - central hot water supply system - check-board system - circulating water system - closed system - closed heat supply system - closed pipeline system - collecting system - colour spraying systems - combined extract-and-input system - combined sewerage system - community complete system in containers or skids - composite cable roof system - compressed-air system - computer-aided system - consolidated power system - control system of survey - cooling system - cooling pipe system - coordinate system - curing system - decimal system - designation system - discrete system - discrete-continual system - distributing system - district heating system - double-pipe system - double-pipeline system - double-pipe riser system - downward system of ventilation - drainage system - drencher system - drop system - dry pipe sprinkler system - dry return system - duct system - earthling system - ejector system - elastic system - electric heating system - embedded panel system - emergency power supply system - energy recovery system - engineer's system of units - filling system of navigation lock - filtration system - fire-alarm sounding system - fire-fighting system - fire-sprinkling system - fire warning system - fixing systems - flange system - flooding system - floor system - floor system of bridge - floor heating system - flow-through system - flue gas cleaning system - fluid power system - forced circulation system - four-axis system - framed system - gas heating system - glaze systems - gravity system - gravity water supply system - grid system - hazard system - heating system - heat pump system - heat supply system - high pressure air-conditioning system - high velocity air-conditioning system - hinged system - hoisting system - hot air system - hot blast system - hot water supply system - inflation system - instantaneously variable system - integral deck system - integrated dispatching system - invariable system - ion-exchange system - irrigation system - land system - large public water system - lateral system - left-handed system - lighting system - local air-conditioning system - lock-filling system - long-line system - low pressure air-conditioning system - low velocity air-conditioning system - low voltage system - main system - management system - measuring system - mechanical systems of a house - medium-size public water system - membrane system - metric system - modular coordinating space system - monitoring system - multistage gas supply system - network system - observing system - once-through system - one-layer cable system - one-pipe heating system - one-pipe loop system - open system - open heat supply system - open return system - overhead system of heating - overhead heating system - panel air system - panel cooling system - pipeline system - piping system - plane system - plumbing system - pollution control system - population settlement group system - post-tensioned system - potabilization system - power system - power-reservoir system - pressurized water treatment system - pre-tensioned system - primary system - public transport system - public water system - public waterworks system - quality control system - quarternary system - railroad system - recirculated heating system - recirculation duct air conditioning system - recool system - rectangular system of street layout - reliability coefficients system - remote control system - reusing water supply system - rigid cable roof system - ring heating system - roll-cap system - round duct system - safety valve of a hydraulic system - saprobity system - separate sewerage system - septic system - sewerage system - single duct air-conditioning system - single-stage system - single-track automatic block system - slab-stringer system - smoke-detector system - solar aquatic system - solar cooling system - solar heating system - solar thermal power system - space system - split system - sprinkler system - statically determinate system - statically indeterminate system - steel plate system - structural system - supply air system - suspension system - thermal reheat system - three-dimensional system - three-way system of reinforcement - thrust system - total energy system - two-dimensional system - two-duct air-conditioning system - two-layer cable roof system - two-pipe water heating system - underfloor heating system - underground cable system - unified modular coordination system - universal sewerage system - upfeed water heating system - up-lighting system - utility system - utility detection system - vacuum system - vandalproof system - variable air volume system - ventilation system - warning system - waste treatment system - waste water system - water system - water measuring systems - water purification system - water quality system - water quality indicator system - water supply system - water supply by zones system - water treatment systems - wind bracing system - zone system - system of forces
- system of masses
- system of scaffolds
- ABC system
- AC system
- acoustical ceiling system
- active solar energy system
- aesthetic value system
- air classification system
- air cycle refrigerating system
- airfield soil classification system
- air pollution control system
- air-to-air system
- air-to-water system
- air transport system
- alarm system
- all-air system
- all outside air system
- all-water coil system
- all water fan coil system
- approach lighting system
- arterial system
- Atterberg soil classification system
- audio alarm system
- automated casting system
- automatic fire alarm system
- automatic fire protection system
- automatic flushing system
- balanced system
- balanced system of streets
- balanced ventilation system
- bar system
- beam structural system
- bell alarm system
- Benoto piling system
- bivalent heat pump system
- bleed-in system
- blow and exhaust system
- blow through air-conditioning system
- blow through fan system
- bootstrap system
- box system
- bridge deck structured system
- British soil classification system
- building system
- building automation system
- building-drainage system
- building gravity drainage system
- building management system
- built-in dust suppression system
- burglar alarm system
- cable system
- central air heating system
- central fan system
- centralized hot-water supply system
- central plant air conditioning system
- changeover system
- circulating system
- circulation water supply system
- circulation water system
- closed system
- closed heat-supply system
- closed-loop heat pump system
- closed-type steam heating system
- coding system
- cogeneration system
- cold supply system
- collapsing-ring bridge rail system
- combined drainage system
- combined sewage system
- complanar system of structural members
- complanar force system
- complete-mix activated sludge system
- composite frame system
- compression system
- concrete suspended flooring system
- constant volume system
- continuous conveying system
- continuous suspension system
- control system
- cooling system
- coordinate system
- cost-efficient floor system
- crossbar approach lighting system
- cross blow ventilation system
- curtain walling system
- custom forming system
- decentralized air conditioning system
- decentralized sewerage system
- deluge sprinkler system
- desiccant cooling system
- designation system
- design-built system
- diffusion-absorption system
- digital indicating system
- direct system
- direct air heating system
- direct cooling system
- direct expansion system
- direct hot water system
- direct hot-water supply system
- direct return system
- direct through air-conditioning system
- distribution system
- domestic hot water system
- domestic sewerage system
- "Dot" recording system
- double-pipe system
- double stack system
- down-feed system
- drainage system
- draw-in system
- draw-through fan system
- draw-through system
- drencher system
- drop system
- dry-pipe sprinkler system
- dual conduit system
- duct system
- ductless split air conditioning system
- dust collecting system
- dust extract system
- early warning system
- economical floor system
- ejector refrigerating system
- elastic mechanical system
- elastic system
- electric heating system
- electric reheat system
- energy management system
- environmental system
- exhaust system
- extract system
- FAA soil classification system
- fan coil system
- Federal aviation administration soil classification system
- fire alarm system
- fire-extinguishing system
- fire protection system
- flat plate-pipe column floor system
- floor structural system
- floor system
- flow-through system
- F-number system
- force system
- forming-and-reinforcing system
- Forton system
- four pipe system
- gantry crane system
- gas heating system
- gravity system
- gravity-flow heating system
- gravity sewerage system
- gravity steam heating system
- gravity water-supply system
- grid coordinate system
- gridiron distribution system
- grounding system
- groundwater control system
- group water supply system
- gyratory system
- heat distribution system
- heating system
- heat-of-light system
- heat pump system
- heat recovery system
- heat supply system
- heat-traced system
- high-intensity lighting system
- high temperature hot-water heating system
- high velocity system
- hold-over system
- holonomic system
- hot-air system
- hot water system
- hot-water circulation system
- hush piling system
- hybrid system
- hydraulic control system
- hydrophilic system
- hydrophobic system
- indirect expansion system
- indirect hot-water supply system
- indirect refrigeration system
- individual sewage-disposal system
- induction air conditioning system
- induction system
- industrialized building systems
- inflation system
- instrument landing system
- integral deck system
- integrated distribution floor system
- inverter driven VRV system
- Jackson system
- land system
- large panel system
- lighting system
- line system
- liquid overfeed system
- local sewerage system
- low-pressure system
- low pressure hot water system
- low velocity system
- main system
- maintenance management system
- mass transit system
- materials-handling system
- mechanical system
- mechanical refrigerating system
- mechanical supply system
- medium pressure hot water system
- medium temperature hot water system
- microbore heating system
- modular system
- modular air conditioning system
- modular compression sealing system
- modular decking system
- modular precast building system
- multiple-degree system
- multiple web system
- multiple well system
- multistage gas-supply system
- multizone system
- municipal piping system
- nail-free formwork system
- non-changeover system
- octopus duct system
- oil fired heating system
- once-through water-supply system
- one-degree system
- one-duct air-conditioning system
- one-pipe system
- one-pipe loop system
- one-way system
- open system
- open expansion tank system
- open-loop control system
- open return system
- open steam heating system
- operation system
- overhead heating system
- overhead runway system
- packaged cogeneration system
- panel air-conditioning system
- panel air system
- panel-lock system
- partially-separate system
- piping system
- plane system of forces
- plane grid system
- plenum system
- plumbing system
- pneumatic conveying system
- post-tensioning system
- preaction sprinkler system
- prefabricated pipe conduit system
- pressurization system
- pressurized heating system
- pressurized hot water system
- primary-secondary system
- principal system
- public system
- public waterwork system
- push-through fan system
- push-through system
- quality system
- rail mounted track laying system
- raised floor system
- rapid transport system
- recool system
- recycling system
- recycling water system
- redundant bridge system
- refrigerating system
- regenerative air cycle system
- regional settlement system
- reheat system
- return system
- return air system
- reverse return system
- reverse return upfeed system
- rising heating system
- road system
- roofing system
- run-around system
- safety system
- scraper system
- sealed heating system
- security system
- self-climbing form system
- separate sewerage system
- separate system
- series loop system
- sewage system
- shunt system
- single-degree-of-freedom system
- single-degree system
- single duct air conditioning system
- single-pipe heating system
- single-pipe heat-supply system
- single-stack plumbing system
- single-storey heating system
- single web system
- single-zone air-conditioning system
- slab-stringer system
- small bore heating system
- smoke control system
- smoke extract ventilation system
- soil system
- soil absorption system
- solar heating system
- solid fuel heating system
- split system
- sprinkler system
- state plane coordinate system
- statically determinate system
- statically indeterminate system
- stationary system of loads
- steam heating system
- steel plate system
- storm sewer system
- structural system
- structural monitoring system
- sub-atmospheric heating system
- subbuilding drainage system
- subsurface drainage system
- subsurface sewage disposal system
- supply air system
- supporting formwork system
- suspension structural system
- swing joint system
- taxiway system
- telpher system
- terminal reheat system
- thermal storage heating system
- thermosiphon system
- three-pipe system
- three-pipe air-conditioning system
- three-pipe heat supply system
- total energy system
- track laying system
- trench shoring system
- trussed system
- truss-supported deck system
- tube cleaning system
- two-degree-of-freedom system
- two-degree system
- two-pipe system
- two value system of proportional balancing
- two value system
- two-way system
- underfloor conduit system
- unvented system
- up-feed heating system
- utility detection system
- vacuum heating system
- vacuum return system
- vacuum waste disposal system
- variable air volume system
- variable refrigerant volume system
- variable volume system
- variable water volume system
- VAV system
- vented system
- ventilation system
- VRV system
- VWV system
- warning system
- water-air heating system
- water booster system
- water-supply system
- water-to-air system
- water-to-water system
- wellpoint system
- wet return system
- wind framing system
- wire cable control system
- wiring system
- zoned system
- zone reheat system

- absolutely consistent system - absolutely direct indecomposable system - absolutely free system - absolutely irreducible system - absolutely isolated system - allowable coordinate system - almost linear system - ample linear system - artificial feel system - automatic block system - automatic deicing system - binary relational system - binary-coded decimal system - block tooling system - Cartesian coordinate system - completely controllable system - completely ergodic system - completely hyperbolic system - completely identifiable system - completely integrable system - completely irreducible system - completely regular system - completely stable system - completely stratified system - complex number system - conical coordinate system - derivational formal system - differential equation system - differential selsyn system - digital counting system - digital transmission system - elliptic coordinate system - elliptic cylindrical coordinate system - externally inconsistent system - finite state system - finitely axiomatizable system - finitely presented system - fully characteristic quotient system - fundamental system of solutions - hydraulic lift system - integrated switching system - isomorphically embedded system - kernel normal system - linearly dependent system - linearly independent system - live hydraulic system - locking protection system - meteor-burst communication system - modular programming system - parabolic cylindrical coordinate system - permanent four-wheel drive system - pure independent system - radio telephone system - reactor protection system - real number system - receiver-amplifier crioelectric system - remote-cylinder hydraulic system - semantically consistent system - simply consistent system - simply incomplete system - simply ordered system - spherical coordinate system - strongly multiplicative system - structurally stable system - sufficiently general coordinate system - system of frequency curves - system of rational numbers - time multiplex system - time-division multiplex system - uniformly complete system - univalent system of notation - universal system of notation - weakly closed system - weighted number system