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Patents > CPCs : CPC B64C23/005 or CPC B64C39/005 & Number of text pages: 6-30

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propulsion (9) · airplane (9) · None (6) · Frame (6) · stability (4) · propeller (4) · design (3) · whole (3) · takeoff (3) · flapping (3) · HTA (3) · wings (3) · airfoil (3) · ascension (3)
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