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Patents > CPCs: CPC B64C39/005 & Number of text pages: 4-6000000

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propulsion (13) · Airplane (11) · None (10) · navigation (8) · frame (8) · airfoil (5) · flapping (5) · wheels (4) · stability (4) · propeller (4) · hybrid (4) · HTA (4) · design (3) · takeoff (3) · rudder (3) · helicopter (3) · wings (3)
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