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Patents > IPCs : IPC B64B1/58 or IPC B64B1/62 & Citations from after 1930: None & Number of text pages: 3-20000000

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LTA (41) · gas (13) · ballonet (11) · balloon (11) · airship (10) · frame (10) · navigation (10) · construction (9) · stability (8) · Dirigibles (5) · Envelope (5) · rigid (5) · fabric (5) · Design (5) · whole (4) · Propulsion (4) · balloons (4) · safety (4) · dirigible (4)
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