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Patents > Year filed: 1908 & Granted: Yes & IPCs: IPC B64C39/00 & CPCs: CPC B64C39/00

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airplane (10) · design (5) · propulsion (5) · propellers (5) · None (4) · frame (4) · stability (3) · aerodynamics (3) · Whole (2) · sustentation (2) · parachutes (2) · lift (2) · landing (2) · wings (2) · Coleopter (2) · Ascension (2) · automatic stability (2)
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