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Patents > CPCs : CPC B64C39/005 or CPC G01C19/38 & Number of claims: 5-6

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navigation (7) · propulsion (6) · airplane (6) · frame (5) · None (5) · hybrid (3) · helicopter (3) · wheels (3) · takeoff (2) · aerodynamics (2) · marine (2) · aerial propeller (2) · heavier-than-air (2) · propeller (2) · design (2) · chassis (2) · landing (2)
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