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发明名称
THREAD FORM
摘要
申请公布号
EP0454147(A3)
申请公布日期
1992.03.25
申请号
EP19910106799
申请日期
1991.04.26
申请人
BAKER HUGHES INCORPORATED
发明人
DELANGE, RICHARD WERNER;EVANS, MERLE EDWARD;ANDERSON, DONNA SAUNDERS
分类号
E21B17/042;F16L15/00;F16L15/06;(IPC1-7):F16L15/00
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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