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| Aircraft engines ： ウィキペディア英語版 |
Aircraft engine
An aircraft engine is the component of the propulsion system for an aircraft that generates mechanical power. Aircraft engines are almost always either lightweight piston engines or gas turbines.
==Aircraft engine manufacturing industry==
As of 2012, the size of the aircraft engine manufacturing market was almost $40 billion. There are over 350 manufacturing companies in the United States employing over 70 thousand people.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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