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What (who) is O 21-class submarine - definition
O 21-class submarine
CLASS OF SUBMARINES BUILT FOR THE ROYAL NETHERLANDS NAVY
O 21 class submarine
The O 21 class was a class of seven submarines, built for the Royal Netherlands Navy. The boats were still incomplete at the start of the German invasion of the Netherlands O 21, O 22, O 23 and O 24 were hastily launched and escaped to the United Kingdom.
Odin-class submarine
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1927 CLASS OF BRITISH SUBMARINES
British O class submarine; Odin class submarine; British O-class submarine
The Odin-class submarine (or "O class") was a class of nine submarines developed and built for the Royal Navy (RN) in the 1920s. The prototype, , was followed by two boats originally ordered for the Royal Australian Navy, but transferred to the RN in 1931 because of the poor economic situation in Australia, and six modified boats ordered for the RN.
British T-class submarine
![Tribune]]'' in 1942](https://commons.wikimedia.org/wiki/Special:FilePath/On Board HM Submarine Tribune, 1942 TR491.jpg?width=200 "Tribune]]'' in 1942")
1938 CLASS OF BRITISH SUBMARINES
Triton class submarine; HMS Thor (P349); Tempest class submarine; Taciturn class submarine; British t class submarine; Zwaardvisch class submarine; British Triton-class submarine; British Triton class submarine; HMS Thor; British T class submarine; Zwaardvisch-class submarine; Triton-class submarine
The Royal Navy's T class (or Triton class) of diesel-electric submarines was designed in the 1930s to replace the O, P, and R classes. Fifty-three members of the class were built just before and during the Second World War, where they played a major role in the Royal Navy's submarine operations.
