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发明名称
ANNULAR SHIM FOR CONSTRUCTION BIT HAVING MULTIPLE PERFORATIONS FOR STRESS RELIEF
摘要
申请公布号
EP0377585(A4)
申请公布日期
1991.03.13
申请号
EP19880906785
申请日期
1988.07.29
申请人
KENNAMETAL INC.
发明人
WHYSONG, HUBERT, H.
分类号
B23K31/02;B23K35/02;E21B10/56;E21C35/18;E21C35/183;(IPC1-7):E21B10/52;B23K9/23
主分类号
B23K31/02
代理机构
代理人
主权项
地址
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