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The interesting submarine gun is a retractable 7,5 cm Uboat cannon from Krupp. I do not know whether it was ever accepted (guess not), but it was shown in the "Artilleristische Monatshefte" (Artillery Monthly) of 1914.
The gun retracted under deck:
Cover open:
Erecting the gun:
On deck, cover closed:
With crew, low angle against sea and on-shore targets:
High angle against air targets:
Unfortunately, no information about the ammunition is given. Only the pictures and some rudimentary data of the gun.
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