Ducted fan aircraft

Details Ducted fan aircraft Ducted fan aircraft

1976-03-25

1977-03-29

Douglas, Alan P.

Transportation

Rail vehicle

Element or attachment

D1207

Patent

active

D02438372

REFERENCES:
patent: D188359 (1960-07-01), Le Bel
patent: D216842 (1970-03-01), Bertelsen
patent: D220293 (1971-03-01), Patrieny
patent: 3082977 (1963-03-01), Arlin
patent: 3481559 (1969-12-01), Apostolescu

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