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seen for the renovation of markforlagda drainage
seen for the renovation of markforlagda drainage
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机译:看到马克福拉格达排水系统的翻新工程
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摘要
After insertion of the plastics lining tube (13) into the existing sewer pipe (11), a material (17), which is lighter than water, is injected into the space between the lining tube and the outer pipe.
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