pressure-gas welding
121Copper — For other uses, see Copper (disambiguation) …
122Dry suit — A dry suit or drysuit provides thermal insulation or passive thermal protection to the wearer while immersed in water,[1][2][3][4] and is worn by divers, boaters, water sports enthusiasts, and others who work or play in or near cold water. A dry… …
123hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …
124aerospace industry — Introduction assemblage of manufacturing concerns that deal with vehicular flight within and beyond the Earth s atmosphere. (The term aerospace is derived from the words aeronautics and spaceflight.) The aerospace industry is engaged in the …
125Forge — For the process of shaping metal by localized compressive forces, see Forging. For other uses, see Forge (disambiguation). A blacksmith s coal forge …
126Shaped charge — Sectioned high explosive anti tank round with the inner shaped charge visible …
127nitrogen group element — ▪ chemical elements Introduction any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …
128Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …
