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发明名称
Converted dual-acting hydraulic drilling jar
摘要
申请公布号
AU7683698(A)
申请公布日期
1999.02.10
申请号
AU19980076836
申请日期
1998.06.02
申请人
DAILEY INTERNATIONAL INC.
发明人
TIMOTHY L. WILSON
分类号
E21B31/113
主分类号
E21B31/113
代理机构
代理人
主权项
地址
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