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Patents > National tech categories : GB 4 propel & steer or USPC 244/110F & Number of diagram pages: 2-7

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propulsion (10) · navigation (9) · frame (6) · propeller (6) · heavier-than-air (5) · rudder (5) · marine (4) · LTA (4) · stability (4) · airplane (3) · flapping (3) · car (3) · takeoff (3) · subsystem (3) · design (3)
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