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Patents > Applicant firm: None & Filing date: 1908 & CPCs : CPC B64C2700/6212 or CPC B64C33/02 or CPC B64C35/00

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flapping (12) · None (11) · Propulsion (8) · Wings (7) · steering (6) · control (6) · subsystem (6) · airplane (6) · ornithopter (6) · Design (5) · frame (4) · propeller (4) · parachute (3) · aerodrome (3) · takeoff (3) · Propellers (3) · rudder (2) · heavier-than-air (2) · airfoil (2) · landing (2)
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