Drilldown: Patents

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Patents > Year filed: 1870 - 1879 & Citations from after 1930: None & Number of text pages: 2-9

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Propulsion (13) · LTA (12) · propeller (5) · flapping (5) · navigation (5) · balloon (5) · human-powered (4) · frame (4) · marine (3) · hybrid (3) · None (3) · track (3) · airplane (3) · hydrogen (2) · propellers (2) · cargo (2) · airship (2) · gas (2) · universal joint (2)
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