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Patents > National tech categories: FR 6.4 & CPCs: CPC B64C33/02 & Number of text pages: 1-2

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Flapping (11) · wings (9) · ornithopter (7) · Propulsion (6) · airplane (6) · Design (5) · toy (3) · propellers (3) · orthopter (3) · ornithopters (3) · LTA (3) · lift (3) · Ascension (3) · hybrid (2) · construction (2) · steering (2) · sustentation (2) · aerostat (2) · Heavier-than-air (2) · Frame (2)
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