Numerous 53 cm (21-inch, 533 mm) torpedoes have been used by the Imperial Japanese Navy and its successor, the Japan Maritime Self-Defense Force, since their first development just before the First World War. Torpedoes of 21-inch caliber are the primary size category used worldwide.
Numerous 53 cm (21-inch, 533 mm) torpedoes have been used by the Imperial Japanese Navy and its successor, the Japan Maritime Self-Defense Force, since their first development just before the First World War. Torpedoes of 21-inch caliber are the primary size category used worldwide.
Source: Wikipedia "Japanese 53 cm torpedo" · CC BY-SA 4.0
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