Drilldown: Patents

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Patents > Year filed: 1870 - 1879 & Number of claims: 3-9

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propulsion (10) · flapping (7) · LTA (7) · frame (6) · propeller (5) · Human-powered (5) · navigation (3) · marine (3) · windmills (3) · sail (2) · balloon (2) · Airplane (2) · propellers (2)
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