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发明名称
Underground drilling systems
摘要
申请公布号
GB2320045(B)
申请公布日期
1999.08.25
申请号
GB19980007100
申请日期
1996.10.10
申请人
* WESTERN WELL TOOL INC
发明人
R ERNST * KRUEGER;BRUCE N * MOORE
分类号
E21B17/10;(IPC1-7):E21B12/00
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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