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Capt John Theilmann in Sikorsky S-51, G-AKCU, of BEA, a?Capt John Theilmann in Sikorsky S-51, G-AKCU, of BEA, at Peterborough prior to the first helicopter-operated public mail service in the UK on 1 June 1948. Date: 1948
Capt John Theilmann in Sikorsky S-51, G-AKCU, of BEA, r?Capt John Theilmann in Sikorsky S-51, G-AKCU, of BEA, receives a Royal Mail Penant at Peterborough prior to the first helicopter-operated public mail service in the UK on 1 June 1948. Date: 1948
