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发明名称
Back-off or holding tool for well casings
摘要
申请公布号
US1908622(A)
申请公布日期
1933.05.09
申请号
US19320605930
申请日期
1932.04.18
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.;JAMES HERMAN J.
分类号
E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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