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Patents > Office : CU or DEG or FR or IN or MX & National tech categories: FR 6.4 & IPCs : IPC B64C3/00 or IPC B64C39/00 & Number of text pages: 4

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Airplane (17) · None (7) · sustentation (6) · design (6) · wings (6) · construction (5) · Lift (4) · frame (4) · stability (4) · aerodynamics (3) · Propellers (3) · whole (3) · Control (3) · fuselage (2) · tail fin (2) · Coleopter (2) · Propulsion (2) · heavier-than-air (2)
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