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Patents > CPCs: CPC B64C23/005 & First filing: No & Number of text pages: 2-3

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airplane (26) · propulsion (14) · design (13) · propellers (12) · hybrid (12) · Helicopter (9) · frame (9) · Ascension (9) · Construction (7) · Lift (6) · Control (6) · propeller (5) · navigation (5) · None (5) · Aerodynamics (5) · stability (4) · chassis (4) · wings (4) · takeoff (4) · sustentation (4)
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