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Patents > National tech categories : GB 4 propel & steer or IT 8 & Number of diagram pages: 2-3

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navigation (8) · propulsion (8) · frame (5) · rudder (5) · propeller (5) · marine (4) · LTA (4) · heavier-than-air (4) · airplane (3) · car (3) · stability (3) · takeoff (3) · design (3)
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