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Patents > Office: FR & IPCs : IPC B64C3/54 or IPC F01B17/04

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airplane (29) · wings (16) · design (13) · lift (12) · sustentation (9) · None (9) · frame (8) · construction (8) · aerodynamics (7) · stability (6) · Control (5) · monoplane (4) · wing warping (4) · Rudder (4) · Propulsion (3) · Steering (3)
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