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发明名称
Device for use in wells
摘要
申请公布号
US2203595(A)
申请公布日期
1940.06.04
申请号
US19360075564
申请日期
1936.04.21
申请人
SECURITY ENGINEERING CO. INC.
发明人
HALL ELWIN B.;ARMENTROUT ARTHUR L.
分类号
E21B49/08
主分类号
E21B49/08
代理机构
代理人
主权项
地址
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