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经营范围
发明名称
Improvements in or relating to rock drill bits
摘要
申请公布号
GB720489(A)
申请公布日期
1954.12.22
申请号
GB19520005617
申请日期
1952.03.04
申请人
ADOLF MEUTSCH
发明人
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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