air-hardened steel
41MythBusters (2008 season) — Country of origin Australia United States No. of episodes 20 (includes 8 specials) Broadcast Original channel Discovery Channel …
42Nazi–Soviet economic relations (1934–1941) — After the Nazis rose to power in Germany in 1933, relations between Germany and the Soviet Union began to deteriorate rapidly, and trade between the two countries decreased. Following several years of high tension and rivalry, Nazi Germany and… …
43Drilling rig — For a detailed diagram of a Petroleum drilling rig, see List of components of oil drilling rigs. Drilling rig preparing rock blasting …
44artillery — /ahr til euh ree/, n. 1. mounted projectile firing guns or missile launchers, mobile or stationary, light or heavy, as distinguished from small arms. 2. the troops or the branch of an army concerned with the use and service of such weapons. 3.… …
45MythBusters (2010 season) — Country of origin Australia United States No. of episodes 25 (includes 4 specials) Broadcast Original channel …
46Plough — Plow redirects here. For the Canadian soldier, see Edward Chester Plow. Plowman redirects here. For the surname, see Plowman (surname). Furrow redirects here. For other uses, see Furrow (disambiguation). For other uses, see Plough… …
47gasoline engine — Most widely used form of internal combustion engine, found in most automobiles and many other vehicles. Gasoline engines vary significantly in size, weight per unit of power generated, and arrangement of components. The principal type is the… …
48M2 Browning — This article is about the .50 caliber M2 machine gun. For the Browning .30 06 machine gun, see M1919 Browning machine gun. Browning Machine Gun, Cal. .50, M2, HB M2HB heavy machine gun …
49Pre-dreadnought battleship — is the general term for all of the types of sea going battleships built between the mid 1890s and 1905. Pre dreadnoughts replaced the ironclad warships of the 1870s and 1880s. Built from steel, and protected by hardened steel armour, pre… …
50Powder-actuated tool — A Powder actuated tool (often called Hilti guns or Ramset guns after two of the companies who manufacture the tools) is a nail gun used in the construction and manufacturing industries to join materials to hard substrates like steel and concrete …
