Drilldown: Patents

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Patents > Year filed: 1890 - 1899 & Office : BE or CH or NL or SE

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LTA (12) · propulsion (10) · frame (7) · balloon (7) · navigation (5) · design (3) · propeller (2) · rigid (2) · flapping (2) · takeoff (2) · compartments (2) · car (2) · whole (2) · airplane (2) · gas (2)
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