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Patents > IPCs: IPC B64B1/58 & Number of figures: 1-2

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LTA (33) · frame (8) · balloon (6) · Propulsion (5) · airship (5) · Balloons (5) · Design (4) · suspension (4) · texture (3) · compartments (3) · Subsystem (3) · stability (3) · envelope (3) · rigid (3)
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