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Patents > CPCs : CPC B61B13/08 or CPC B64C39/005 & Number of diagram pages: 3-4

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propulsion (17) · airplane (12) · stability (9) · navigation (9) · None (8) · frame (8) · propeller (8) · LTA (5) · HTA (5) · parachute (4) · landing (4) · helicopter (4) · wheels (3) · hybrid (3) · airfoil (3) · design (3) · car (3)
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