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Turbojet — Turbojets are the oldest kind of general purpose jet engines. Two engineers, Frank Whittle in the United Kingdom and Hans von Ohain in Germany, developed the concept independently during the late 1930s, although credit for the first turbojet is… … Wikipedia
Ejection seat — In aircraft, an ejection seat is a system designed to rescue the pilot or other crew of an aircraft (usually military) in an emergency. In most designs, the seat is propelled out of the aircraft by an explosive charge or rocket motor, carrying… … 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
Kitchen rudder — The Kitchen Rudder is the familiar name for Kitchen s Patent Reversing Rudders , a combination rudder and directional propulsion delivery system for relatively slow speed displacement boats which was invented in the early 20th century by Admiral… … Wikipedia

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