Drilldown: Patents

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Patents > Patent agent: None & National tech categories : USPC 244/30 or USPC 416/169R

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LTA (24) · navigation (13) · propulsion (12) · frame (9) · balloon (9) · propeller (7) · None (7) · car (5) · compartments (5) · safety (5) · dirigible (4) · rudder (3) · cargo (3) · landing (2) · parachute (2) · stability (2) · airplane (2) · marine (2)
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