Drilldown: Patents

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Patents > Inventor country: US & Family year: 1909 & Number of figures: 9-10

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airplane (10) · propeller (10) · propulsion (9) · frame (8) · stability (7) · hybrid (6) · helicopter (5) · navigation (5) · flapping (5) · rudder (5) · design (4) · marine (4) · hydroplane (3) · construction (3) · safety (3) · takeoff (3) · propellers (3) · gyroscope (3) · lift (3)
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