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Type 4 40 cm Rocket Launcher
The was a 400 mm rocket mortar used by the Imperial Japanese Army in the final stages of World War II.
==Development and design==
The Type 4 rocket mortar was developed in the final stages of World War II by the Imperial Japanese Army Technical Bureau, as a relatively low-cost, easy to produce weapon, which had an advantage of greater accuracy over conventional mortars in that it fired a spin-stabilized projectile. The first units were deployed in 1943, and were used in limited numbers in combat during the Battle of Iwo Jima and Battle of Okinawa. Due to its ease of construction, it was produced in limited numbers and distributed to hidden arsenals for use as last-ditch weapons during the projected Allied invasion of the Japanese home islands.
Unlike the Type 4 20 cm Rocket, which could be launched from an ordinary pipe or culvert with sufficient diameter, wooden rails, or even directly from a slope in the ground,〔() Taki's Imperial Japanese Army home page〕 the Type 4 40cm rocket required specially designed launch rails. 〔() Taki's Imperial Japanese Army home page〕
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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