Mauser MG 213
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The Mauser MG 213 was a 20 mm aircraft-mounted revolver cannon developed for the Luftwaffe during World War II. It was never put into service, but formed the basis for several post-war developments by the Allies, including the Aden and DEFA cannons. A 30 mm version was developed as the MG 213C or MK 213.
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