Drilldown: Patents

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Patents > Filing date: January 1909 & Number of claims: 2-3

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None (5) · helicopter (4) · propeller (4) · LTA (4) · airplane (3) · Stability (3) · Propulsion (3) · balloon (3) · steering (2) · Propellers (2) · parachute (2) · Hybrid (2) · Design (2) · Construction (2)
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