Drilldown: Patents

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Patents > Grant date: 1800 - 1899 & National tech categories : USPC 244/22 or USPC 244/30

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LTA (24) · navigation (15) · frame (12) · propulsion (12) · balloon (10) · car (9) · propeller (8) · landing (4) · safety (4) · rudder (4) · flapping (4) · Human-powered (3) · marine (3) · glider (3) · parachute (2) · airplane (2) · ornithopter (2) · cargo (2) · stability (2)
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