Drilldown: Patents

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Patents > Filing date: 1800 - 1899 & National tech categories : DE 77h or USPC 244/30

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LTA (28) · navigation (16) · propulsion (16) · frame (12) · balloon (12) · propeller (12) · car (10) · safety (5) · None (4) · rudder (4) · landing (3) · hybrid (3) · marine (3)
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