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经营范围
发明名称
Multiple zone pump and packer apparatus
摘要
申请公布号
US2963091(A)
申请公布日期
1960.12.06
申请号
US19560590481
申请日期
1956.06.11
申请人
BAKER OIL TOOLS, INC.
发明人
CONRAD MARTIN B.
分类号
E21B33/122
主分类号
E21B33/122
代理机构
代理人
主权项
地址
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