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发明名称
METHOD OF DETERMINING DRILL BIT WEAR
摘要
申请公布号
GB8807889(D0)
申请公布日期
1988.05.05
申请号
GB19880007889
申请日期
1988.04.05
申请人
FOREX NEPTUNE SA
发明人
分类号
E21B12/02;E21B44/00;G01H1/00;G05B19/4065
主分类号
E21B12/02
代理机构
代理人
主权项
地址
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