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Patents > CPCs: CPC B64C39/005 & Number of text pages: 3-8 & Number of diagram pages: 2

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airplane (8) · None (7) · propulsion (7) · frame (6) · hybrid (6) · helicopter (5) · navigation (5) · propeller (4) · wheels (3) · takeoff (3) · aerial propeller (3) · flapping (3) · airfoil (2) · landing (2) · aerodynamics (2) · design (2) · lift (2) · stability (2)
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