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Patents > IPCs : IPC B64C3/54 or IPC G08G1/042 & Number of text pages: 3-6

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