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Patents > Filing date: 1867

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propulsion (14) · navigation (10) · balloon (8) · LTA (7) · propeller (4) · marine (3) · hybrid (3) · gas (3) · flapping (3) · dirigible (2) · kite (2) · rocket (2) · rudder (2) · ornithopter (2) · springs (2) · captive (2) · takeoff (2)
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