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发明名称
DRILLING BIT
摘要
申请公布号
PL167198(B1)
申请公布日期
1995.08.31
申请号
PL19910292670
申请日期
1991.12.06
申请人
NORVIC SA
发明人
KAALSTAD OSCAR W.
分类号
B28D1/14;E02F3/20;E21B10/04;E21B10/06;E21B10/08;E21B10/12;E21B10/16;E21B10/18;E21B10/20;E21B10/22;E21B10/52;E21B10/56;E21B17/10;(IPC1-7):E21B10/08
主分类号
B28D1/14
代理机构
代理人
主权项
地址
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