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Patents > Publication date: June 1911 & National tech categories : FR 6.4 or GB 4 propel & steer

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airplane (12) · stability (9) · subsystem (5) · automatic stability (4) · propellers (3) · design (3) · frame (2) · parachute (2) · aerial propeller (2) · hybrid (2) · propulsion (2) · None (2) · wing warping (2) · construction (2) · wings (2) · LTA (2)
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