Drilldown: Patents

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Patents > Grant date: 1902 & Number of claims: 7-20

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propulsion (6) · marine (3) · parachute (2) · hybrid (2) · helicopter (2) · petroleum (2) · frame (2) · propeller (2) · design (2) · navigation (2) · military (2) · bamboo (2) · Balloons (2)
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