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Patents > IPCs: IPC B64C3/54 & Number of text pages: 3-10

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None (6) · Robert Welford (2)
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None (5) · Robert Welford (2)
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Airplane (13) · None (12) · Wings (10) · Design (9) · control (7) · Lift (5) · stability (4) · Aerodynamics (4) · Sustentation (3) · monoplane (3) · construction (3) · frame (3) · fuselage (2) · biplane (2) · navigation (2) · skids (2)
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