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发明名称
DETECTING DRILL BIT WEAR
摘要
申请公布号
GB8905582(D0)
申请公布日期
1989.04.19
申请号
GB19890005582
申请日期
1989.03.10
申请人
EXXON PRODUCTION RESEARCH COMPANY
发明人
分类号
E21B10/08;E21B10/22;E21B12/02;E21B44/00;(IPC1-7):E21B12/02
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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