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Patents > CPCs : CPC B64C23/005 or None & Number of figures: 22-40

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design (10) · airplane (10) · stability (9) · Propulsion (8) · frame (8) · whole (7) · propeller (6) · Propellers (6) · navigation (5) · None (4) · Aerodynamics (4) · hybrid (4) · parachutes (4) · wings (4)
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