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发明名称
Reverse circulation drilling system wth hexagonal pipe coupling
摘要
申请公布号
GB2351306(A8)
申请公布日期
2001.01.03
申请号
GB20000017742
申请日期
1999.01.19
申请人
ARDIS L HOLTE
发明人
ARDIS L HOLTE
分类号
E21B10/26;E21B4/14;E21B10/32;E21B10/36;E21B10/66;E21B21/16;(IPC1-7):F16L35/00;E21B17/02
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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