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发明名称
Well tool
摘要
申请公布号
US3023821(A)
申请公布日期
1962.03.06
申请号
US19550491369
申请日期
1955.03.01
申请人
ETHERINGTON WALTER H
发明人
ETHERINGTON WALTER H.
分类号
E21B7/06;E21B7/08
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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