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Patents > CPCs: CPC B64B1/40 & Number of diagram pages: 1-4 & Number of figures: 1-2

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LTA (24) · balloon (15) · stability (5) · frame (5) · Airship (5) · None (3) · safety (3) · kite (3) · suspension (3) · balloons (2) · military (2) · construction (2) · descent (2) · design (2) · fun (2) · aerostat (2) · propeller (2)
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