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经营范围
发明名称
Tubing wear detector
摘要
申请公布号
US2322343(A)
申请公布日期
1943.06.22
申请号
US19400361197
申请日期
1940.10.14
申请人
DIA-LOY COMPANY
发明人
BRANDON ARTHUR H.
分类号
E21B47/09
主分类号
E21B47/09
代理机构
代理人
主权项
地址
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