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Patents > National tech categories : FR 5 or IT 8 or USPC 244/153R or USPC 244/80 & Number of claims: 5-8

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stability (12) · None (5) · frame (5) · kite (5) · automatic stability (4) · airplane (3) · navigation (3) · propeller (3) · wheels (2) · takeoff (2) · equilibrium (2)
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