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发明名称
Well device
摘要
申请公布号
US2498791(A)
申请公布日期
1950.02.28
申请号
US19460678655
申请日期
1946.06.22
申请人
CLARK JAMES M
发明人
CLARK JAMES M.
分类号
E21B33/129
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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