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M4 Tractor
The M4 High-Speed Tractor was an artillery tractor used by the US Army from 1943.
==Design and development==
The M4 was based on the chassis and drive train of the obsolescent M2 Light Tank which introduced the trailing〔American AFVs of World War II, Ed. by Duncan Crow, Doubleday, 1972, pp. 2–5〕 idler. This common practice of re-using old vehicles simplified design, allowed for easy production, and made maintenance in the field easier.
One variant was designed to tow anti-aircraft guns and another for howitzers.〔 The rear compartment carried the gun crew and other equipment and some later variants included a crane to assist with heavier projectiles.〔
Two types of ammunition boxes were used on all models: a 90 mm box with side "tailgates" to access 90 mm shells pigeon-holed in the sides, and a combination box for 155mm / 8-inch / 240 mm ammunition with a rear tailgate, and hoist.
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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