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Patents > Filing date: 1910 & IPCs : IPC B64C17/04 or IPC B64C23/00

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airplane (19) · None (10) · hybrid (9) · stability (9) · propellers (8) · Design (8) · propulsion (7) · whole (5) · aerodynamics (5) · helicopter (4) · construction (4) · control (4) · gyroscope (4) · propeller (4) · frame (4) · takeoff (4)
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Showing below up to 39 results in range #1 to #39.

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