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Patents > National tech categories : GB 4 propel & steer or USPC 244/80 & Number of text pages: 7-12

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navigation (6) · frame (6) · propeller (5) · stability (5) · rudder (3) · heavier-than-air (3) · airplane (3) · propulsion (3) · control (2) · None (2) · steel (2) · whole (2) · Aeroplane (2)
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