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

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propulsion (15) · propellers (6) · aerodynamics (5) · design (5) · airplane (4) · aerial propeller (3) · construction (3) · subsystem (3) · helicopter (3) · wings (3) · marine (2) · airship (2) · propeller (2) · frame (2)
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Showing below up to 26 results in range #1 to #26.

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