From each sub's "Interval" line in the upc file.
S-18 Class 12-30-1943
S-42 Class 9-3-1944
Narwhal 12-11-1946
Porpoise Class 11-11-1944
Salmon Class 2-23-1945
Sargo Class 12-11-1946
Gar Class 15-11-1945
Tambor Class 12-11-1946
Gato Class 1-16-1967
Balao Class 7-11-1963
Tench Class 1-1-1979
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