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Patents > Office: Other & Filing date: 1912 & IPCs: IPC B64C11/00

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Propulsion (14) · Propellers (7) · aerodynamics (5) · Design (5) · airplane (4) · wings (3) · Subsystem (3) · Construction (3) · helicopter (3) · frame (2) · propeller (2) · marine (2) · aerial propeller (2) · Airship (2)
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