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Patents > Year granted: 1910 - 1919 & Filing date: 1909 & IPCs : IPC B64C3/00 or IPC B64C33/00

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frame (8) · Airplane (7) · Design (6) · flapping (5) · None (4) · stability (4) · propulsion (4) · Construction (4) · propeller (4) · navigation (4) · wings (3) · subsystem (3) · ornithopter (3) · Tendeur (2) · whole (2) · ornithopters (2)
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