Drilldown: Patents

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Patents > IPCs : IPC B64B1/40 or IPC B64C27/04 & Number of text pages: 4-6000000

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helicopter (13) · propulsion (8) · LTA (8) · stability (6) · control (6) · propellers (5) · hybrid (4) · Airplane (4) · airship (4) · navigation (4) · balloon (4) · design (4) · construction (3) · landing (3) · aerodynamics (3) · None (3) · ascension (3) · captive (3)
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