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Patents > IPCs: IPC B64C27/04 & Citations from after 1930: None & Number of claims: 2-4

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helicopter (16) · propulsion (11) · propellers (9) · airplane (8) · ascension (8) · hybrid (7) · design (6) · Lift (5) · heavier-than-air (4) · Construction (4) · sustentation (4) · navigation (2) · aerodynamics (2) · HTA (2) · structure (2) · frame (2) · descent (2) · control (2) · VTOL (2) · whole (2)
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Showing below up to 33 results in range #1 to #33.

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