German submarine U-31

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Invention

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Science and technology

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What Wikipedia says

German submarine U-31 was a Type VIIA U-boat of Nazi Germany's Kriegsmarine during World War II. She was laid down on 1 March 1936 as yard number 912, launched on 25 September and commissioned on 28 December 1936.

Excerpt from the Wikipedia article “German submarine U-31 (1936)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: scan: Julo, Public domain, via Wikimedia Commons.