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Patents > Filing date: 1910 - 1919 & IPCs : IPC B62D1/06 or IPC B64C33/00

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flapping (12) · ornithopter (11) · design (9) · wings (7) · propulsion (7) · stability (6) · frame (6) · lift (6) · airplane (6) · hybrid (5) · glider (4) · HTA (4) · human-powered (4) · None (3) · aerodynamics (3)
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Showing below up to 35 results in range #1 to #35.

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