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Identification and warning system for underground conduits or pipes laid by the 'directional drilling' method
Identification and warning system for underground conduits or pipes laid by the 'directional drilling' method
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机译:“定向钻孔”法敷设的地下管道或管道的识别和警告系统
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PCT No. PCT/AU97/00470 Sec. 371 Date Mar. 2, 1999 Sec. 102(e) Date Mar. 2, 1999 PCT Filed Jul. 22, 1997 PCT Pub. No. WO98/03764 PCT Pub. Date Jan. 29, 1998The invention provides a warning to the excavation above a pipe, conduit or cable laid underground by a service utility by the directional drilling method by providing a coloured area of drilling mud and/or soil about the pipe, conduit or cable. A colouring material is added to the drill fluid during the direct drilling operation which then colours the drill mud and/or soil about the pipe, conduit or cable.
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