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Patents > Full specification filed date: 1890 - 1899 & Supplementary to patent : Patent FR-1912-461530 or None

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navigation (12) · propeller (12) · propulsion (9) · frame (7) · LTA (7) · rudder (5) · None (4) · airplane (4) · balloon (4) · stability (3) · human-powered (3) · hybrid (3) · airfoil (3)
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