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Patents > National tech categories: FR 6.4 & CPCs : CPC B64C13/00 or CPC B64C35/00 & Number of figures: 3-4

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Airplane (20) · design (9) · hydroaeroplane (9) · Frame (8) · control (8) · stability (7) · hydroplane (7) · rudder (6) · subsystem (5) · steering (5) · buoyancy (5) · navigation (5) · landing (5) · Aerodynamics (5) · None (4) · wheels (4) · Wings (4)
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