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Patents > IPCs : IPC B64B1/58 or IPC B64B1/62 & Number of diagram pages: 2

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LTA (15) · construction (5) · Airship (5) · gas (3) · frame (3) · balloon (3) · Propulsion (2) · fabric (2) · Propellers (2) · Dirigibles (2) · Design (2) · navigation (2) · gas valve (2) · stability (2) · ballonet (2) · suspension (2) · hydrogen (2) · gas pressure (2)
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