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发明名称
Stegborr för rotationsborrning
摘要
申请公布号
FI21161(A)
申请公布日期
1946.03.27
申请号
FID21161
申请日期
1942.10.22
申请人
A.G. FUER BERGBAU-U. HUETTENBEDORF
发明人
NIENHAUS HANS
分类号
(IPC1-7):E21B9/12
主分类号
(IPC1-7):E21B9/12
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