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Type 4 75 mm AA Gun
The was an anti-aircraft gun developed by the Imperial Japanese Army, which went into production in 1943. The Type 4 number was designated for the year the gun was accepted, 2604 in the Japanese imperial year calendar, or 1944 in the Gregorian calendar.〔War Department TM-E-30-480 ''Handbook on Japanese Military Forces'' September 1944 p 400〕 Due to the lack of raw materials available and the great damage by air raids to its industrial infrastructure, only 70 units were made. These units were retained for defense of the Japanese home islands during World War II.
==History and development==
In 1927, the Bofors company of Sweden had designed a new 75 mm AA gun which was purchased by the Royal Swedish Navy. This was developed into a mobile anti-aircraft gun with a wheeled carriage, which was exported to the Republic of China, Persia, and Thailand.
Japanese forces captured examples of the Bofors M29 75mm AA gun from the National Revolutionary Army of the Kuomintang government of China, and the Army Technical Bureau was impressed with its performance, which was much superior to the existing Japanese Type 88 75 mm AA Gun. By “reverse engineering” a close copy was designed and went into production in 1943.〔Bishop, ''The Encyclopedia of Weapons of World War II''.〕 However, Japan lacked the raw materials and its industrial infrastructure was too damaged by air raids to follow through with mass production. Only 70 units were completed before the surrender of Japan.〔() Taki's Imperial Japanese Army〕
Type 5 75 mm Tank Gun was a variant design of the Type 4 75 mm AA Gun used as the main armament on the Type 4 Chi-To medium tank.〔Tomczyk, ''Japanese Armor Vol. 4'', pp. 19, 22, 30.〕
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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