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Patents > National tech categories : DE 77h.5 or USPC 244/45R or USPC 244/80 & Number of figures: 11-30

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stability (13) · airplane (9) · frame (8) · None (7) · control (6) · automatic stability (5) · wings (4) · navigation (3) · design (3) · hybrid (3) · HTA (2) · whole (2) · takeoff (2) · biplane (2) · propeller (2) · LTA (2) · glider (2) · fuselage (2) · equilibrium (2)
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