Drilldown: Patents

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Patents > Year granted: 1890 - 1899 & National tech categories: None & Number of text pages: 4

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propulsion (8) · LTA (5) · frame (4) · balloon (4) · propeller (4) · navigation (3) · None (2) · takeoff (2) · safety (2) · parachute (2) · magnet (2) · landing (2) · hybrid (2) · windmill (2) · car (2) · design (2)
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