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Patents > Related to aircraft: Yes & IPCs: IPC B64B1/62

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LTA (26) · gas (10) · navigation (6) · ballonet (5) · balloon (5) · balloons (4) · lift (4) · stability (3) · hydrogen (3) · Aerostat (3) · non-rigid (2) · pressure (2) · rigid (2) · safety (2) · elevation (2) · control (2) · Construction (2) · compartments (2) · airship (2) · air pressure (2)
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