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经营范围
发明名称
Retractable packer
摘要
申请公布号
US2389985(A)
申请公布日期
1945.11.27
申请号
US19410394784
申请日期
1941.05.23
申请人
HOUSTON OIL FIELD MATERIAL COMPANY, INC.
发明人
JUSTICE GEORGE E.;THURSTON FRANK M.;YOUNG FURMAN N.
分类号
E21B33/134
主分类号
E21B33/134
代理机构
代理人
主权项
地址
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