Drilldown: Patents

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Patents > Year filed: 1840 - 1849 & National tech categories : USPC 244/151R or None

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propulsion (11) · LTA (10) · None (8) · balloon (7) · propeller (4) · navigation (4) · whole (3) · wheels (3) · cargo (3) · frame (3) · passenger (3) · aero-as-power (2) · human-powered (2) · marine (2) · steam (2) · ascension (2) · landing (2) · track (2) · rudder (2)
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Showing below up to 34 results in range #1 to #34.

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