The Bofors 40 mmAutomaticGunL/60 (often referred to simply as the "Bofors 40 mmgun", the "Boforsgun" and the like, see name) is an anti-aircraft autocannon
37 mmautomatic air defense gun M1939 (61-K) (Russian: 37-мм автоматическая зенитная пушка образца 1939 года (61-К)) is a Soviet 37 mm calibre anti-aircraft