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Patents > Grant date: 1920 - 1929 & IPCs : IPC B64B1/62 or IPC B64C11/00 or IPC B64C13/00

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airplane (14) · Control (13) · design (10) · propellers (8) · propulsion (7) · aerodynamics (6) · Steering (6) · frame (6) · wings (4) · construction (4) · Subsystem (4) · rudder (4) · propeller (3) · None (3)
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