German submarine U-9

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Science and technology

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What Wikipedia says

German submarine U-9 was a Type IIB U-boat of Nazi Germany's Kriegsmarine. Her keel was laid down on 8 February 1935, by Germaniawerft in Kiel as yard number 543. She was launched on 30 July 1935 and commissioned on 21 August, with Korvettenkapitän Hans-Günther Looff in command.

Excerpt from the Wikipedia article “German submarine U-9 (1935)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: not identified. "Official photograph", Public domain, via Wikimedia Commons.