Drilldown: Patents

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Patents > Year granted: 1890 - 1899 & Number of text pages: 4-30 & Number of diagram pages: 2

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LTA (10) · propulsion (8) · navigation (7) · balloon (6) · frame (5) · hybrid (4) · gas (3) · human-powered (3) · propeller (3) · flapping (3)
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