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经营范围
发明名称
Stop for well tubing
摘要
申请公布号
US2948339(A)
申请公布日期
1960.08.09
申请号
US19530385248
申请日期
1953.10.09
申请人
OTIS ENGINEERING CORPORATION
发明人
FREDD JOHN V.
分类号
E21B23/02
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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