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经营范围
发明名称
Apparatus for wear indicating and logging while drilling
摘要
申请公布号
US2575173(A)
申请公布日期
1951.11.13
申请号
US19470731242
申请日期
1947.02.27
申请人
STANDARD OIL COMPANY
发明人
JOHNSON EVERETT A.
分类号
B23Q17/09;E21B12/02;E21B47/00
主分类号
B23Q17/09
代理机构
代理人
主权项
地址
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