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发明名称
Well device
摘要
申请公布号
US2571478(A)
申请公布日期
1951.10.16
申请号
US19490098253
申请日期
1949.06.10
申请人
OTIS HERBERT C
发明人
OTIS HERBERT C.
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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