37 mm automatic air defense gun M1939

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Science and technology

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What Wikipedia says

The 37 mm automatic 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 gun developed during the late 1930s and used during World War II. The land-based version was replaced in Soviet service by the AZP S-60 during the 1950s.

Excerpt from the Wikipedia article “37 mm automatic air defense gun M1939 (61-K)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: One half 3544, Public domain, via Wikimedia Commons.