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working hole bottom

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  • Bottom (TV series) — Infobox television show name = Bottom format = comedy (sitcom) runtime = 30 minutes (approximate) creator = Adrian Edmondson Rik Mayall starring = Adrian Edmondson Rik Mayall country = United Kingdom network = BBC2 first aired = 1991 last aired …   Wikipedia

  • Bottom bracket — A square taper cartridge bottom bracket. The bottom bracket on a bicycle connects the crankset to the bicycle and allows the crankset to rotate freely. It contains a spindle that the crankset attaches to, and the bearings that allow the spindle… …   Wikipedia

  • bottom tool — noun 1. : a tool held under a piece of work and used in conjunction with another tool working on top (as the lowermost of a pair of dies or fullers) 2. : a tool for machining the bottom of a hole …   Useful english dictionary

  • Ocean-bottom seismometer — (OBS) is a seismometer that is designed to record the earth motion under oceans and lakes from man made sources and natural sources …   Wikipedia

  • The Black Hole — For other uses, see Black hole (disambiguation). The Black Hole Directed by Gary Nelson Produced by Ron W. Miller …   Wikipedia

  • mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… …   Universalium

  • Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …   Wikipedia

  • Directional drilling — A horizontal directional drill in operation Directional drilling (or slant drilling) is the practice of drilling non vertical wells. It can be broken down into three main groups: Oilfield Directional Drilling, Utility Installation Directional… …   Wikipedia

  • Hebden, North Yorkshire — infobox UK place country = England official name = Hebden latitude = 54.064 longitude = 1.962 static static image caption = Hebden Post Office population = 216 area total km2 = 14.50 population density =Pop density km2 to mi2|(14.9)… …   Wikipedia

  • Antarctica — /ant ahrk ti keuh, ahr ti /, n. the continent surrounding the South Pole: almost entirely covered by an ice sheet. ab. 5,000,000 sq. mi. (12,950,000 sq. km). Also called Antarctic Continent. * * * Antarctica Introduction Antarctica Background:… …   Universalium

  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

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