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Patents > National tech categories: FR 6.4 & CPCs: CPC B64C23/005 & Number of claims: 3-7

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airplane (17) · hybrid (12) · design (10) · propulsion (10) · ascension (8) · propellers (8) · helicopter (8) · frame (7) · None (6) · construction (6) · lift (5) · heavier-than-air (4) · aerodynamics (4) · sustentation (4)
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