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time signalling device

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  • British absolute block signalling — The principle of the British absolute block system of railway signalling is to facilitate the safe operation of a railway by preventing more than one train from occupying a defined section of route at the same time. This system is used on double… …   Wikipedia

  • Real-time locating standards — Articleissues copyedit=May 2008According to ISO/IEC FDIS 19762 5 [ [http://www.autoid.org/SC31/sc31.htm] (ISO Subcommittee SC31)] an RTLS (real time locating system) is a combination of hardware and software that is used to continuously determine …   Wikipedia

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  • Heliograph — A Heliograph (from the Greek helios (Lang el| Ἥλιος), meaning sun , and (γραφειν) = write) is a wireless solar telegraph that signals using Morse code flashes of sunlight reflected by a mirror. The flashes are produced by momentarily pivoting the …   Wikipedia

  • Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London …   Wikipedia

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  • Peripheral Component Interconnect — Infobox Computer Hardware Bus name = PCI fullname = peripheral component interconnection caption = Five 5V 32 bit PCI expansion slots on a motherboard invent date = July 1993 invent name = Intel super date = 2004 super name = PCI Express width =… …   Wikipedia

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