Drilldown: Patents

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Patents > Filing date: 1800 - 1899 & Family year: 1890 - 1899 & Number of text pages: 4-6000000

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navigation (16) · propulsion (15) · LTA (14) · frame (12) · propeller (11) · rudder (8) · balloon (7) · design (7) · stability (6) · hybrid (5) · parachute (4) · car (4) · flapping (4) · airfoil (4) · propellers (3) · airplane (3) · glider (3) · compartments (3) · wheels (3) · rigid (3)
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