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发明名称
Scraper for oil well tubing
摘要
申请公布号
US2149810(A)
申请公布日期
1939.03.07
申请号
US19350036848
申请日期
1935.08.19
申请人
R. W. FAIR
发明人
KLIEWER EDWARD A.
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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