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经营范围
发明名称
Well tool
摘要
A centralizer for pump rod string which minimizes the resistance offered thereby to flow of well fluids therepast having two pairs of longitudinally and circumferentially spaced radially outwardly extending ribs.
申请公布号
US4809777(A)
申请公布日期
1989.03.07
申请号
US19870002767
申请日期
1987.01.12
申请人
SABLE, DONALD E.
发明人
SABLE, DONALD E.
分类号
E21B17/10;(IPC1-7):E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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