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

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propulsion (19) · heavier-than-air (10) · frame (9) · navigation (8) · propeller (7) · flapping (6) · steam (6) · wings (5) · car (5) · airplane (5) · rudder (5) · design (4) · LTA (3) · takeoff (3) · parachute (3) · airfoil (3) · glider (3) · whole (3) · motor (3)
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Showing below up to 35 results in range #1 to #35.

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