NBN E 29-120-1974 5000 《钢质圆形管接头 有尾焊接管接头PN25》.pdf

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NBN 72-1957 1250 《螺纹接头，可锻铸铁》.pdf

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NBN 873-1971 7500 《非塑封膜包PVC接头 压力管模具接头恒温测试》.pdf

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