Drilldown: Patents

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Patents > Year filed: 1860 - 1869 & Granted: Yes & Supplementary to patent: None & National tech categories : DE 77 or None

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LTA (6) · marine (5) · balloon (4) · propeller (4) · feathering (3) · paddle-wheel (3) · dirigible (3) · navigation (3) · propulsion (2) · paddle-wheels (2) · ornithopter (2) · None (2)
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