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Patents > CPCs : CPC B64C11/006 or CPC B64C17/00 & Number of claims: 9-11

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Stability (19) · automatic stability (11) · airplane (10) · None (9) · pendulum (4) · propeller (4) · frame (4) · construction (3) · control (3) · design (3) · propellers (2) · propulsion (2) · equilibrium (2) · electricity (2) · subsystem (2) · wheels (2) · aerodynamics (2)
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