Drilldown: Patents

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Patents > Year granted: 1890 - 1899 & National tech categories: None & Number of figures: 8-50000000

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propulsion (8) · navigation (5) · LTA (5) · frame (4) · propeller (4) · balloon (3) · fabric (3) · cargo (3) · passenger (3) · flapping (2) · piloting (2) · electricity (2) · rigid (2) · stability (2) · parachute (2) · safety (2)
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