FR8219E - Perfectionnements à une surface d'ascension applicable aux appareils destinés à pouvoir s'élever, se soutenir et se diriger dans l'air
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Perfectionnements à une surface d'ascension applicable aux appareils destinés à pouvoir s'élever, se soutenir et se diriger dans l'air
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B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/007—Propulsive discs, i.e. discs having the surface specially adapted for propulsion purposes
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FR8219D1906-09-221907-09-21Perfectionnements à une surface d'ascension applicable aux appareils destinés à pouvoir s'élever, se soutenir et se diriger dans l'air
ExpiredFR8219E
(fr)