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B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/16—Blades
B64C11/20—Constructional features
B64C11/24—Hollow blades
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Engineering & Computer Science
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Aviation & Aerospace Engineering
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FR17047D1911-06-241912-03-20Perfectionnements aux surfaces de propulsion et de sustentation applicables à la navigation dans l'air et dans l'eau
ExpiredFR17047E
(fr)