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Patents > Inventor country : DE or HU & Filing date: 1910 - 1919 & IPCs: IPC B64C39/00

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Airplane (10) · Design (7) · wings (6) · control (5) · lift (5) · Propellers (4) · Whole (3) · helicopter (3) · Frame (3) · monoplane (3) · Construction (3) · aeroplane (3)
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