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发明名称
DRILLING TOOL
摘要
申请公布号
EP0391873(A3)
申请公布日期
1991.04.03
申请号
EP19900850127
申请日期
1990.04.03
申请人
UNIROC AKTIEBOLAG
发明人
LOEF, STIG UNO
分类号
E21B7/20;E21B10/32;E21B10/66;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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