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发明名称
DRILLING TOOL
摘要
申请公布号
GB2080367(B)
申请公布日期
1984.04.11
申请号
GB19810021560
申请日期
1981.07.13
申请人
PREUSSAG AG
发明人
分类号
E21B4/00;E21B4/02;E21B7/06;E21B7/08;E21B17/20;(IPC1-7):E21B7/06
主分类号
E21B4/00
代理机构
代理人
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地址
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