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Patents > Office: FR & National tech categories: FR 6.4 & IPCs: IPC B64C3/54

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airplane (28) · wings (16) · design (13) · Lift (12) · sustentation (9) · Construction (8) · Frame (8) · Aerodynamics (7) · None (7) · control (5) · Stability (5) · rudder (4) · wing warping (4) · monoplane (4) · Steering (3)
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