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Patents > CPCs: CPC B64C31/04 & Number of figures: 3-10

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human-powered (17) · flapping (10) · LTA (8) · Frame (8) · wings (7) · propulsion (7) · Design (6) · Airplane (5) · wheels (4) · hybrid (4) · Propellers (3) · Construction (3) · propeller (2) · human-powered? (2) · ornithopter (2) · car (2) · sustentation (2)
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