Ingenieurbüro Glückauf
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The Ingenieurbüro Glückauf was a department of the Reich Ministry of Armaments and War Production, which during the Second World War was the design office of the Hauptausschuß Schiffbau. It completed construction and production plans for U-Boats of the Kriegsmarine. This affected both submarine types that were designed for the U-boat war, as well as midget submarines which were used by the small combat units of the Kriegsmarine.