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经营范围
发明名称
A drill string
摘要
申请公布号
GB2269411(B)
申请公布日期
1996.03.06
申请号
GB19920016635
申请日期
1992.08.05
申请人
* BOART HARDMETALS
发明人
THOMAS GERARD * KIELY;PETER CHARLES * BREWITT
分类号
E21B21/10;(IPC1-7):E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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