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Patents > IPCs : IPC B64C3/18 or IPC B64C33/00 & Number of diagram pages: 3-20000000

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flapping (12) · frame (10) · ornithopter (10) · airplane (9) · design (6) · propulsion (6) · wings (5) · stability (4) · lift (4) · navigation (3) · construction (3) · propeller (3) · sustentation (3)
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