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Patents > Filing date: 1800 - 1899 & National tech categories: GB 4 & Number of text pages: None

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propulsion (10) · LTA (5) · propeller (4) · frame (4) · flapping (3) · hybrid (3) · passenger (2) · parachute (2) · navigation (2) · rubber (2) · metal (2) · marine (2) · springs (2) · gas (2) · steam (2) · takeoff (2) · cargo (2) · balloon (2)
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