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B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/02—Hub construction
B64C11/14—Spinners
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FR418774D1910-07-291910-07-29Perfectionnements aux appareils aériens augmentant le rendement de propulsion et diminuant la résistance à la pénétration
ExpiredFR418774A
(fr)