Drilldown: Patents

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Patents > National tech categories: None & Family year: 1800 - 1899 & Number of text pages: 3-5

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propulsion (13) · propeller (10) · LTA (9) · navigation (7) · balloon (6) · frame (5) · hybrid (4) · flapping (4) · None (4) · parachute (4) · stability (4) · design (3) · marine (3)
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Showing below up to 39 results in range #1 to #39.

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