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Patents > Office : FR or MX or None & IPCs: IPC B64C23/00 & Number of text pages: 4

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airplane (11) · propulsion (7) · Hybrid (6) · propellers (5) · stability (5) · navigation (5) · ascension (4) · LTA (4) · design (4) · helicopter (3) · propeller (3) · construction (3) · takeoff (3) · frame (3) · sustentation (3)
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