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Patents > National tech categories : FR 6.1 or FR 6.4 & Number of figures: 21-23

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airplane (9) · stability (7) · design (6) · construction (5) · wings (5) · frame (5) · propellers (4) · propulsion (4) · control (3) · rudder (3) · aerodynamics (3) · chassis (3) · biplane (3)
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