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发明名称
Rollenbohrer fuer drehendes Tiefbohren
摘要
申请公布号
DE652955(C)
申请公布日期
1937.11.11
申请号
DE1934H141429D
申请日期
1934.10.06
申请人
HUGHES TOOL COMPANY
发明人
分类号
E21B10/08
主分类号
E21B10/08
代理机构
代理人
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