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Patents > National tech categories : GB 4 propel & steer or USPC 244/30 & Number of text pages: 2

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LTA (19) · navigation (7) · balloon (6) · propulsion (6) · car (5) · rudder (5) · frame (5) · propeller (4) · safety (3) · flapping (3) · aerodynamics (2) · whole (2) · subsystem (2) · stability (2) · parachute (2) · airfoil (2) · wings (2) · hybrid (2)
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