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经营范围
发明名称
DRILL BITS
摘要
申请公布号
ZA8306285(B)
申请公布日期
1984.04.25
申请号
ZA19830006285
申请日期
1983.08.25
申请人
BOART INT LTD
发明人
GWILYM JAMES REES
分类号
E21C
主分类号
E21C
代理机构
代理人
主权项
地址
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