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发明名称
DRILL BIT
摘要
申请公布号
GB8726868(D0)
申请公布日期
1987.12.23
申请号
GB19870026868
申请日期
1987.11.17
申请人
BOART HARDMETALS (EUROPE) LTD
发明人
分类号
C21D9/22;C22C38/44;C22C38/46;E21B4/06;E21B10/36
主分类号
C21D9/22
代理机构
代理人
主权项
地址
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