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Patents > Patent agent : Dupont et Elluin or None & CPCs: CPC B64C17/00

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None (209) · stability (98) · airplane (75) · automatic stability (49) · design (34) · frame (17) · control (16) · wings (16) · aerodynamics (16) · construction (12) · lift (9) · subsystem (8) · rudder (7) · navigation (7) · pendulum (7) · equilibrium (7) · propeller (6) · wheels (6)
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None (292) · Patent DE-1911-11-16 Otto Albin Budig (3) · Patent US-1908-1077750 (2) · Patent FR-1910-423998 (2) · Patent FR-1912-450608 (2) · Patent US-1912-1040434 (2)
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