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Patents > CPCs: CPC B64C39/00 & Number of text pages: 3-6 & Number of figures: 6-7

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design (13) · airplane (12) · frame (10) · propulsion (8) · propellers (7) · stability (6) · Construction (6) · whole (5) · Chassis (5) · None (4) · sustentation (4) · lift (4) · fuselage (4) · wings (4) · control (3) · motors (3) · heavier-than-air (3)
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