Drilldown: Patents

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Patents > IPCs : IPC B64C23/00 or IPC B64C3/14 & Number of claims: 5

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airplane (14) · Frame (8) · design (8) · hybrid (7) · propellers (6) · propulsion (4) · propeller (4) · Construction (4) · None (4) · helicopter (4) · ascension (4) · whole (4) · sustentation (3) · stability (3)
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