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Patents > Year granted: 1900 - 1909 & CPCs: CPC B64C23/005 & Number of text pages: 2-3

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propulsion (17) · airplane (16) · helicopter (8) · Hybrid (8) · Frame (7) · Design (7) · navigation (7) · Construction (5) · propeller (5) · Propellers (5) · None (5) · ascension (5) · steering (4) · control (4) · Cables (4) · stability (3) · Parachutes (3) · Lift (3) · Takeoff (3)
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