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#11
19-12-05, 01:28
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Similar sort of system was used in RFC aircraft in the First World War, to communicate between pilot instructor and trainee - was known as the Gosport Tube, after the RFC training base where it was invented.
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Member: Prairie Command, Ex-Military Land Rover Association 2110, MVPA 29055 ’45 Chevrolet C8A CMP HUP “Staff Car ”, ’82 Land Rover Series III, 109" ex-MoD, ’80 Honda CX500D, ’48 Ferguson TE20 
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