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4.5-inch Gun M1
The 4.5 inch Gun M1 was a field gun developed in the United States in the beginning of World War II. It shared the same carriage with the 155mm Howitzer M1 and fired the same ammunition as the British BL 4.5 inch Medium Field Gun. The weapon was used by the US Army in Northwest Europe late in the war for corps support; with the end of hostilities it was declared obsolete.
==Development and production==
In 1920 the US Army Ordnance started to work on a new medium field gun. Since the US Army had already employed the 4.7 inch Gun M1906 during World War I, this caliber was also selected for the new weapon. The development resulted in 4.7 inch Gun M1922E on Carriage M1921E. Due to lack of funding, the design never reached production.〔Hogg - ''Allied Artillery of World War II'', p 50-51.〕〔Zaloga - ''US Field Artillery of World War II'', p 18-19.〕
In 1939 the program was restarted; the renewed design, designated 4.7 inch Gun T3, was ready by early 1940; it utilized the same carriage as the concurrently developed 155 mm howitzer. At this stage, the army decided to change the weapon to use the British 4.5 inch ammunition. The modified gun was standardized in April 1941 as 4.5 inch Gun M1 on Carriage M1.〔〔
The production started in September 1942 and continued until February 1944.〔
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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