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3-inch M1918 gun : ウィキペディア英語版
3-inch Gun M1918

The 3-inch M1918 gun was a United States 3-inch anti-aircraft gun that entered service in 1918 and served until it was finally superseded by the 3" M3 gun in 1930. The M3 was subsequently replaced by the M1 90mm AA gun just prior to the opening of World War II. The M3 3" gun was later adapted for the anti-tank role, serving as the main armament of the M10 tank destroyer during World War II.
==The predecessor : 3-inch M1917==

The 3-inch M1917 was the United States Army's first dedicated anti-aircraft gun, entering service during World War I. Only a few were built, as the similar 3-inch M1918 on a mobile mount was considered more useful and was produced in large numbers.
Development of the M1917 started in 1915, and as the name implies, took two years to enter service. The gun was essentially an unmodified 3-inch M1903 (76.2 mm L/55) coastal-defense gun barrel on a new fixed mount allowing it to be aimed to high elevations.〔Berhow, pp. 243-248〕〔(Excerpt from online book ''A Magnificent Fight: Marines in the Battle for Wake Island'' by Robert J. Cressman )〕 A number were used during World War I on fixed mountings; 116 were completed by April 1919. Most of the weapons were deployed at United States Army Coast Artillery Corps installations after WWI. In the immediate post-war era it was developed as the 3-inch M2, using a removable barrel liner. In 1928 it was further improved in the 3-inch M4 by using a thicker removable liner that eased manufacturing. However, the M2 and M4 appear to have been produced in small quantities. The M1917, M2, and M4 remained in service through World War II.〔

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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