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Patents > IPCs : IPC B64C3/18 or IPC B64C33/00 & Number of diagram pages: 3-5

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flapping (11) · ornithopter (9) · propulsion (7) · frame (7) · airplane (6) · wings (4) · stability (4) · design (4) · navigation (3) · hybrid (3) · HTA (3) · None (3) · human-powered (2) · propellers (2) · airfoil (2) · ornithopters (2)
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