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Patents > IPCs : IPC B64B1/58 or IPC B64D31/02 & Number of text pages: 3-8

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LTA (31) · frame (12) · balloon (9) · navigation (7) · ballonet (7) · stability (6) · airship (6) · construction (6) · gas (5) · dirigible (5) · texture (4) · envelope (4) · design (4)
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