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发明名称
Drill hole slope indicator
摘要
申请公布号
US2824380(A)
申请公布日期
1958.02.25
申请号
US19540440733
申请日期
1954.07.01
申请人
ESSO RESEARCH AND ENGINEERING COMPANY
发明人
NELSON NORMAN A.
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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