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Patents > Office: FR & IPCs: IPC B64B1/62 & CPCs: CPC B64B1/62

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LTA (22) · gas (5) · Compartments (4) · Dirigibles (4) · propulsion (4) · subsystem (3) · Airship (3) · ballonet (3) · Propellers (3) · Navigation (3) · Construction (3) · lift (3) · Design (3)
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