GAS LEAKAGE PREVENTING METHOD FOR LAID GAS PIPE

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  机译： 防止已铺设的天然气管道漏气的方法和装置

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  机译： 管道连接器，用于通过将各种管道（例如放置在地下的水管道，油管道，煤气管道或电缆保护管道）进行连接来防止泄漏

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