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发明名称
Method and bit for directional horizontal boring
摘要
申请公布号
AU2001288875(B2)
申请公布日期
2005.06.02
申请号
AU20010288875
申请日期
2001.09.07
申请人
EARTH TOOL COMPANY, L.L.C.
发明人
ROBERT F. CRANE;STEVEN W. WENTWORTH
分类号
E21B7/06;(IPC1-7):E21B007/04;E21B010/16
主分类号
E21B7/06
代理机构
代理人
主权项
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