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Patents > National tech categories: USPC 244/80 & Number of text pages: 3-4

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stability (18) · automatic stability (8) · airplane (7) · None (5) · frame (5) · propeller (5) · navigation (5) · whole (3) · wheels (3) · takeoff (3) · pendulum (3) · wings (3) · aeroplane (3) · Design (2) · equilibrium (2) · LTA (2) · rudder (2) · propulsion (2)
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