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Patents > CPCs : CPC B22D33/00 or CPC B64C39/005 & Number of claims: 5-8

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propulsion (9) · navigation (9) · None (8) · airplane (6) · frame (6) · hybrid (4) · heavier-than-air (4) · design (3) · helicopter (3) · wheels (3) · flapping (3) · landing (3)
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