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Patents > CPCs : CPC B64B1/00 or CPC B64C2700/6256 & Number of text pages: 6-40

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LTA (24) · propulsion (11) · balloon (8) · frame (8) · navigation (8) · propeller (7) · marine (7) · None (6) · cargo (5) · safety (5) · airplane (5) · hybrid (4) · Airship (4) · propellers (4) · design (4)
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