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发明名称
Pit-level indicator
摘要
申请公布号
US2618155(A)
申请公布日期
1952.11.18
申请号
US19450626208
申请日期
1945.11.02
申请人
CONNER RAY E;TAYLOR JOSEPH W
发明人
CONNER RAY E.;TAYLOR JOSEPH W.
分类号
E21B21/08
主分类号
E21B21/08
代理机构
代理人
主权项
地址
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