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Patents > IPCs : IPC B22D33/00 or IPC B64C27/04 & Number of text pages: 1-2

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helicopter (20) · propulsion (11) · propellers (9) · Airplane (6) · hybrid (6) · None (5) · Ascension (4) · design (4) · lift (4) · Helicoplane (2) · traction (2) · sustentation (2) · parachutes (2) · wings (2) · Construction (2) · Frame (2)
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