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发明名称
Hydraulic jar
摘要
申请公布号
SG44963(A1)
申请公布日期
1997.12.19
申请号
SG19960010267
申请日期
1996.07.19
申请人
HOUSTON ENGINEERS, INC
发明人
ROBERTS BILLY JAMES
分类号
E21B;E21B31/113;(IPC1-7):E21B31/113
主分类号
E21B
代理机构
代理人
主权项
地址
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