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Patents > IPCs : IPC B64C23/00 or IPC B64C3/52 & Number of diagram pages: 2

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airplane (13) · None (8) · propulsion (6) · hybrid (5) · helicopter (5) · Control (4) · propellers (4) · Lift (4) · ascension (3) · Sustentation (3) · parachutes (3) · Wings (3) · chassis (3)
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