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Auxiliary Ocean Tugs (ATA)

Originally Ocean-Going Tugs (AT)

1922-1945

ATA-174 class (ATA 174-213, 219-238)
ATA-214 (ex net layer) class (ATA 214-218)

Other AT/ATA Hull Numbers, 1920-1945

AT 119-127: see ATR 41-49
AT 128-130: see BAT 3-5
AT-146: see ATR-90 (ex BAT-2)
ATA 166-167: see AT-61 class
AT 170-173: see ATR 97-100