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Patents > IPCs : IPC B64C33/00 or IPC B64C5/04 & Number of text pages: 3

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flapping (15) · propulsion (10) · ornithopter (7) · frame (7) · None (5) · airplane (5) · stability (4) · navigation (4) · hybrid (4) · propeller (3) · human-powered (3) · design (3) · wings (3) · Construction (3) · connections (2) · glider (2) · joints (2) · Lift (2)
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