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发明名称
Cement retainer
摘要
申请公布号
US1992933(A)
申请公布日期
1935.03.05
申请号
US19330674656
申请日期
1933.06.07
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.;BURT CLARENCE E.
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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