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GB/T 41666.7-2024_Chinese: Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 7: Lining with spirally-wound pipes (Chinese: 地下无压排水管网非开挖修复用塑料管道系统 第7部分：螺旋缠绕内衬法) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 41666.7-2024
