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

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propulsion (13) · heavier-than-air (8) · frame (7) · wings (4) · navigation (4) · car (4) · propeller (4) · steam (4) · flapping (4) · airplane (3)
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Showing below up to 21 results in range #1 to #21.

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