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Patents > Filing date: 1910 - 1919 & IPCs: IPC B64C33/02 & Number of diagram pages: 1

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flapping (17) · wings (11) · ornithopter (8) · wing (6) · airplane (6) · subsystem (6) · frame (6) · propulsion (5) · navigation (5) · toy (4) · None (4) · design (4) · steering (3) · HTA (3) · hybrid (3) · lift (3)
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