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Patents > IPCs : IPC B64C3/00 or IPC B64C33/02 & Family year: 1908

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flapping (8) · propulsion (7) · airplane (7) · design (5) · Wings (4) · ornithopter (4) · control (3) · propellers (3) · aerodrome (3) · None (3) · Cargo (2) · navigation (2) · sustentation (2) · frame (2) · propeller (2) · Orthopter (2)
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