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发明名称
Drill pipe wiper
摘要
申请公布号
US2392146(A)
申请公布日期
1946.01.01
申请号
US19430492033
申请日期
1943.06.24
申请人
HALL JESSE E
发明人
HALL JESSE E.
分类号
E21B33/08
主分类号
E21B33/08
代理机构
代理人
主权项
地址
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