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Patents > National tech categories : USPC 244/22 or USPC 244/90R & Number of figures: 8-30

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frame (13) · flapping (11) · Airplane (10) · stability (8) · ornithopter (7) · navigation (6) · propeller (6) · rudder (6) · wheels (6) · propulsion (5) · hybrid (5) · landing (4) · takeoff (3) · wings (3)
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