Drilldown: Patents

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Patents > Year granted: 1900 - 1909 & IPCs : IPC B64C23/00 or IPC B64C33/00 & Number of diagram pages: 3-20000000

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flapping (6) · airplane (5) · hybrid (4) · ornithopter (4) · frame (4) · navigation (3) · ascension (3) · propulsion (3) · Propellers (2) · Takeoff (2) · airfoil (2) · construction (2) · Helicopter (2) · descent (2) · propeller (2)
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