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Patents > Filing date: 1911 & National tech categories : AT 77d or USPC 244/80

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stability (13) · airplane (10) · None (8) · control (8) · subsystem (6) · steering (5) · frame (5) · equilibrium (5) · wings (5) · automatic stability (5) · pendulum (4) · navigation (4) · balance (4) · suspension (3) · piloting (3) · construction (3) · flapping (3)
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