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经营范围
发明名称
Cement retainer
摘要
申请公布号
US2189697(A)
申请公布日期
1940.02.06
申请号
US19390262849
申请日期
1939.03.20
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
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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