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Sikorsky S-51Bea Helicopters British European Airways Sikorsky S-51 with Gpo Postmen Unloading the Mail Bags after a Royal Air Mail Service from Peterborough to Yarmouth Date: 1948
Sikorsky HO3S-1 122720, LVT (A)-4'and two Piasecki HRP-1sUnited States Marine Corps - Sikorsky HO3S-1 122720 (msn 51.117) carrying out a personnel transfer from / to a USMC Landing Vehicle Tracked LVT (A)-4 (one of many vartiants of the LVT family)