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经营范围
发明名称
Cementing plug
摘要
申请公布号
US2141370(A)
申请公布日期
1938.12.27
申请号
US19380192020
申请日期
1938.02.23
申请人
ARMENTROUT ARTHUR L;GUDIE RAY W
发明人
ARMENTROUT ARTHUR L.;GUDIE RAY W.
分类号
E21B33/16
主分类号
E21B33/16
代理机构
代理人
主权项
地址
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