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Adress: Luoxin Industrial Park, Luoyang, HenanLarge diameter steel pipe quen
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The sewage well cover is buried in the ground. I don¡¯t know what to do when I am buried .
1. If there are as-built drawings, locate them by drawing
2 , if there is no completed drawing, if the general position can be determined, in the range "striking" to find
3 , preliminary determination with a metal detector in the approximate range