Photographs and brief specifications of American built helicopters; each craft listed is at least in scale model stage; some are being flight tested and several are being produced and sold to industry.
1947 annual directory of rotary wing aircraft
Aero Digest
Aero Digest ; 54 , n 1
1947
Aufsatz (Zeitschrift)
Englisch
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1948 annual directory of rotary wing aircraft
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1949 annual directory of Rotary Wing Aircraft
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