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DEFA cannon
The DEFA cannon (''Direction des Études et Fabrications d'Armement'') is a family of widely used French-made aircraft revolver cannons firing the standard 30 mm caliber NATO rounds. ==Design history== The initial DEFA 551 was developed in the late 1940s. It was based on the German Mauser MG 213C, an experimental revolver cannon developed for the Luftwaffe. The MG 213 never reached production, but inspired the DEFA, the very similar British ADEN cannon, and the smaller American M39 cannon. As the DEFA 552 it entered production in 1954. In 1968 an upgraded version, Canon 550-F3, was developed, entering production in 1971 as the DEFA 553. The new version provided a new feed system, nitro-chrome plated steel barrel, forged drum casing, and improved electrical reliability.
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