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B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
B64C11/30—Blade pitch-changing mechanisms
B64C11/306—Blade pitch-changing mechanisms specially adapted for contrarotating propellers
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FR900644D1943-08-171943-08-17Dispositif de conjugaison du pas de deux hélices coaxiales, tournant en sens inverse à la même vitesse
ExpiredFR900644A
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