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Patents > Grant date: December 1909 & Supplementary to patent : Patent FR-1911-430455 or None

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airplane (9) · propulsion (9) · stability (8) · navigation (7) · None (6) · frame (5) · LTA (5) · gyroscope (4) · subsystem (3) · propellers (3) · marine (3) · helicopter (3) · lift (3) · ascension (3) · automatic stability (3)
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