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发明名称
DRILL BIT
摘要
申请公布号
GB8926837(D0)
申请公布日期
1990.01.17
申请号
GB19890026837
申请日期
1989.11.28
申请人
EXXON PRODUCTION RESEARCH COMPANY
发明人
分类号
E21B10/48;E21B10/04;E21B10/14;E21B10/18;E21B10/60
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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