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German submarine U-21

U-21 may refer to one of the following German submarines:

AI wikipedia summery

BundesmarineType 206 submarineSecond World WarType IIB submarineGerman submarine U-21 (1936)Type UC II submarineSM UC-21Type UB II submarineSM UB-21HMS PathfinderFirst World WarType U 19 submarineSM U-21 (Germany)submarinesGermanSM U-21 (Austria-Hungary)Article Main page

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