Helicopter

Details Helicopter Helicopter

1980-08-05

1985-04-02

Douglas, Alan P.

Transportation

Aircraft, spacecraft, or fuselage

Vertical takeoff type

Patent

active

D02782278

REFERENCES:
patent: D239710 (1976-04-01), Garrison
Flight International, Jan. 3 1974, p. 11, Helicopter in three views at bottom of page.

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