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发明名称
Subsurface control apparatus
摘要
申请公布号
US2993541(A)
申请公布日期
1961.07.25
申请号
US19570687406
申请日期
1957.10.01
申请人
BAKER OIL TOOLS, INC.
发明人
CONRAD MARTIN B.
分类号
E21B23/06
主分类号
E21B23/06
代理机构
代理人
主权项
地址
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