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Patents > Filing date: 1912 & IPCs : IPC B63H25/02 or IPC B64B1/00

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LTA (17) · navigation (8) · balloon (7) · frame (6) · dirigible (6) · airship (5) · construction (4) · design (3) · suspension (3) · ballonet (2) · propulsion (2) · stability (2) · fabric (2) · marine (2)
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