Drilldown: Patents

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Patents > Year filed: 1880 - 1889 & Number of figures: 8-20

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LTA (26) · navigation (15) · propulsion (14) · frame (8) · propeller (8) · flapping (8) · car (7) · balloon (7) · cargo (5) · airship (5) · rudder (5) · passenger (4) · ornithopter (4) · human-powered (4) · stability (4) · military (3) · safety (3) · None (3) · wheels (3) · control (3)
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