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Patents > IPCs : IPC B63B1/22 or IPC B64C33/00 & Number of diagram pages: 3-6

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ornithopter (11) · flapping (10) · frame (7) · airplane (6) · stability (5) · propulsion (5) · wings (5) · HTA (3) · navigation (3) · design (3) · propeller (3) · hybrid (3) · subsystem (2) · lift (2) · human-powered (2) · rudder (2) · cables (2) · airfoil (2) · ornithopters (2) · sustentation (2)
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