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Patents > IPCs: IPC B64B1/62 & Citations from after 1930: None

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LTA (48) · gas (16) · navigation (10) · ballonet (9) · balloon (9) · balloons (7) · safety (5) · compartments (5) · propulsion (5) · airship (5) · pressure (4) · subsystem (4) · Construction (4) · lift (4) · aerostat (4) · Dirigibles (4)
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