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cutting edge of shield

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  • tunneling shield — ▪ engineering  machine for driving tunnels in soft ground, especially under rivers or in water bearing strata. The problem of tunneling under a river had defied the engineering imagination for centuries because of the difficulty of preventing mud …   Universalium

  • Oxy-fuel welding and cutting — Oxyacetylene redirects here. For the song, see Cubanate. Side of metal, cut by oxygen propane cutting torch …   Wikipedia

  • WAR AND WARFARE — TO THE DESTRUCTION OF THE FIRST TEMPLE The methods of offensive and defensive warfare developed side by side in the Ancient Near East. The development of weapons was dependent upon the supply of raw materials, such as stone, metal, and wood; the… …   Encyclopedia of Judaism

  • military technology — Introduction       range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …   Universalium

  • Tunnel boring machine — A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine (TBM) also known as a mole , is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.… …   Wikipedia

  • Kitchen knife — A kitchen knife is any knife that is intended to be used in food preparation. While much of this work can be accomplished with a few general purpose knives – notably a large chef s knife, a tough cleaver, and a small paring knife – there are also …   Wikipedia

  • Japanese sword — Traditional Samurai swords and fittings A Japanese sword, or nihontō (日本刀 or にほんとう, lit. Japanese sword …   Wikipedia

  • Sword — For other uses, see Sword (disambiguation) and Swords (disambiguation). Swiss longsword, 15th or 16th century A sword is a bladed weapon (edged weapon) used primarily for cutting or thrusting. The precise definition of the term varies with the… …   Wikipedia

  • European dueling sword — The European dueling sword in the narrow sense is a basket and cage hilted weapon in use specifically in duels from the late 17th to the 19th century. It evolved through several forms of the rapier to the smallsword mdash; reflecting the… …   Wikipedia

  • technology, history of — Introduction       the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …   Universalium

  • Chainsaw safety features — Main article: Chainsaws This article is about risk control methods specific to chainsaws and chainsaw operations. Chainsaws incorporate numerous safety features common to many engine driven power tools. Manufacturers have invented numerous design …   Wikipedia

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