25 mm automatic air defense gun M1940 (72-K) (Russian: 25-ммавтоматическаязенитнаяпушкаобразца1940года (72-К)) was a Soviet 25 mm caliber anti-aircraft...
automatic air defense gun M1939 (61-K) (Russian: 37-ммавтоматическаязенитнаяпушкаобразца 1939 года (61-К)) is a Soviet 37 mm calibre anti-aircraft gun developed...