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发明名称
DRILL BIT WITH SET OF UNDERREAMER ARMS
摘要
申请公布号
EP0847477(A4)
申请公布日期
1999.06.09
申请号
EP19970932181
申请日期
1997.06.11
申请人
HOLTE, ARDIS L.
发明人
HOLTE, ARDIS L.
分类号
E21B10/26;E21B4/14;E21B10/32;E21B10/36;E21B10/66;E21B21/16;(IPC1-7):E21B10/66
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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