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经营范围
发明名称
ROCK BIT
摘要
申请公布号
IE862386(L)
申请公布日期
1987.04.18
申请号
IE19860002386
申请日期
1986.09.08
申请人
SMITH INTERNATIONAL INC
发明人
分类号
E21B10/08;B22F7/06;C22C26/00;E21B10/52;E21B10/56;E21B10/567;(IPC1-7):E21B10/00
主分类号
E21B10/08
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代理人
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