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发明名称
BOHRWERKZEUG, INSBESONDERE FUER TIEFBOHRUNGEN
摘要
申请公布号
DE2107805(B2)
申请公布日期
1972.07.13
申请号
DE19712107805
申请日期
1971.02.18
申请人
发明人
分类号
E21B4/14;E21B21/00;(IPC1-7):E21B7/00
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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