Drilldown: Patents

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Patents > Year filed: 1860 - 1869 & First filing: No

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Propulsion (9) · navigation (6) · aerostat (6) · LTA (5) · motors (4) · None (4) · control (4) · propellers (3) · balloon (3) · gas (2) · launching (2) · flapping (2) · Hybrid (2)
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