Drilldown: Patents

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Patents > Year filed: 1880 - 1889 & Number of text pages: 4-20 & Number of figures: 4-20

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navigation (16) · LTA (15) · balloon (8) · propulsion (8) · propeller (8) · car (7) · cargo (5) · frame (5) · rudder (5) · stability (4) · passenger (4) · flapping (4) · safety (3) · hybrid (3)
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