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发明名称
Drift indicator for use in the drilling of bore holes
摘要
申请公布号
GB894565(A)
申请公布日期
1962.04.26
申请号
GB19600041403
申请日期
1960.12.01
申请人
VARNEY ENGINEERING CORPORATION
发明人
分类号
E21B47/022
主分类号
E21B47/022
代理机构
代理人
主权项
地址
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