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发明名称
Well close-off means
摘要
申请公布号
US3283823(A)
申请公布日期
1966.11.08
申请号
US19630306799
申请日期
1963.09.05
申请人
WARRINGTON ELBERT E
发明人
WARRINGTON ELBERT E.
分类号
E21B33/127;E21B33/128
主分类号
E21B33/127
代理机构
代理人
主权项
地址
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