Drilldown: Patents

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Patents > Patent agent: None & National tech categories: GB 4 without buoyant & Citations from after 1930: None

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propulsion (13) · heavier-than-air (8) · frame (5) · flapping (5) · steam (4) · motor (3) · parachute (3) · propeller (3) · wings (3) · car (3) · airplane (3) · whole (3) · navigation (3)
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Showing below up to 21 results in range #1 to #21.

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