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Patents > IPCs : IPC B64C19/00 or IPC B64C27/04 & Number of claims: 4-11

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helicopter (16) · propulsion (7) · None (5) · propeller (5) · hybrid (5) · airplane (5) · stability (4) · propellers (4) · ascension (4) · lift (3) · sustentation (3) · wings (2) · HTA (2) · steering (2) · whole (2)
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