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Patents > IPCs : IPC B64C23/00 or IPC E04H15/04 & Number of figures: 4

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airplane (10) · None (8) · Helicopter (5) · hybrid (3) · design (3) · propulsion (3) · ascension (3) · frame (3) · propellers (2) · LTA (2) · Lift (2) · heavier-than-air (2) · wings (2) · aerodynamics (2) · Construction (2)
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