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Patents > Filing date: 1910 & IPCs : IPC B63H1/12 or IPC B64C23/00

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airplane (15) · Propellers (11) · None (9) · stability (7) · Design (7) · hybrid (7) · Propulsion (6) · Frame (5) · Construction (5) · whole (5) · Aerodynamics (5) · takeoff (4) · control (4) · wings (4) · propeller (4) · gyroscope (4) · helicopter (4) · heavier-than-air (3)
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Showing below up to 39 results in range #1 to #39.

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