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Patents > IPCs : IPC B64B1/58 or IPC F42B19/46 & Number of claims: 4-5

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LTA (19) · Frame (6) · navigation (5) · construction (4) · propulsion (4) · envelope (4) · airship (3) · gas (3) · balloon (3) · Texture (3) · design (3) · rigid (2) · rudder (2) · Hybrid (2) · lift (2) · Dirigibles (2) · dirigible (2) · balloons (2) · ballonet (2) · marine (2)
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