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Patents > Inventor country : CA or GB or NL or RU & CPCs: CPC B64B1/58

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LTA (23) · None (11) · envelope (5) · fabric (4) · hybrid (3) · texture (2) · covering (2) · Navigation (2) · frame (2) · dirigibles (2) · balloon (2) · stability (2) · ballonet (2)
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