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Patents > IPCs : IPC B64B1/40 or IPC B64C9/38 & Number of text pages: 2-3

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LTA (30) · balloon (9) · stability (9) · suspension (9) · frame (7) · nacelle (7) · design (7) · navigation (5) · balloons (5) · construction (5) · propulsion (5) · airship (4) · captive (4) · car (4)
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