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Patents > CPCs : CPC B64C13/0421 or CPC B64C39/005 & Number of claims: 5-7

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None (10) · navigation (9) · propulsion (7) · airplane (7) · frame (6) · wheels (4) · heavier-than-air (4) · Design (3) · propeller (3) · landing (3) · helicopter (3) · hybrid (3)
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