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经营范围
发明名称
Well pumping control
摘要
申请公布号
US2690713(A)
申请公布日期
1954.10.05
申请号
US19500173342
申请日期
1950.07.12
申请人
THESSEN
发明人
URMANN BENJAMIN H.;WHITEHILL ALBERT J.;THESSEN WAYNE H.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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