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发明名称
Reverse circulation drilling system with bit locked underreamer arms
摘要
申请公布号
AU755442(C)
申请公布日期
2003.06.12
申请号
AU19980084873
申请日期
1998.07.17
申请人
ARDIS L. HOLTE
发明人
ARDIS L. HOLTE
分类号
E21B10/32;E21B10/66;(IPC1-7):E21B10/66
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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