SM UB-31
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Q7391640
SM UB-31 was a German Type UB II submarine or U-boat in the German Imperial Navy during World War I. The U-boat was ordered on 22 July 1915 and launched on 16 November 1915. She was commissioned into the German Imperial Navy on 25 March 1916 as SM UB-31.
1915-11-16T00:00:00Z
1915-11-16T00:00:00Z
ship launching
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