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经营范围
发明名称
Well bore packer
摘要
申请公布号
US2857972(A)
申请公布日期
1958.10.28
申请号
US19550527974
申请日期
1955.08.12
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
分类号
E21B33/12
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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