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Patents > IPCs : IPC B64C19/00 or IPC B64C27/04 & Number of claims: 3-4

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helicopter (11) · Propulsion (8) · airplane (6) · hybrid (5) · ascension (5) · lift (5) · design (4) · propellers (4) · sustentation (3) · None (3) · HTA (2) · Frame (2) · heavier-than-air (2)
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