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经营范围
发明名称
Drill heads
摘要
申请公布号
GB986170(A)
申请公布日期
1965.03.17
申请号
GB19620046814
申请日期
1962.12.11
申请人
DIAMANT BOART
发明人
分类号
E21B10/48
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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