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Patents > Inventor country : DE or FR & National tech categories: GB 4 propel & steer

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propulsion (9) · LTA (8) · navigation (4) · car (3) · propeller (3) · flapping (3) · frame (3) · heavier-than-air (3) · hybrid (2) · whole (2) · valve (2) · subsystem (2) · rudder (2) · marine (2) · ascension (2) · jet (2) · wings (2) · electricity (2) · design (2) · balloon (2)
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