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发明名称
GESTEINSBOHRWERKZEUG
摘要
申请公布号
DE2127661(B2)
申请公布日期
1976.12.09
申请号
DE19712127661
申请日期
1971.06.03
申请人
发明人
分类号
E21B21/00;(IPC1-7):E21B9/35
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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