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Patents > National tech categories: AT 77d & IPCs: None & Number of text pages: 3-5

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wings (11) · airplane (11) · stability (7) · frame (6) · propeller (5) · propulsion (5) · Design (5) · construction (4) · navigation (4) · flapping (3) · aerodynamics (3) · control (3) · automatic stability (3) · equilibrium (3) · propellers (3)
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