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Patents > IPCs : IPC B64C3/18 or IPC B64C33/00 & Citations from after 1930: None & Number of diagram pages: 3-20000000

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frame (10) · flapping (9) · ornithopter (8) · wings (7) · airplane (7) · design (6) · propulsion (5) · stability (5) · lift (4) · propeller (3) · hybrid (3) · HTA (3) · navigation (3) · Construction (3) · sustentation (3)
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