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发明名称
Erdbohranlage, bei der der Drehtisch und das Hubwerk unter Zwischenschaltung nachgiebiger Mittel mit je einem Elektromotor gekuppelt sind
摘要
申请公布号
DE507896(C)
申请公布日期
1930.09.22
申请号
DE1929S090032D
申请日期
1929.02.19
申请人
SIEMENS-SCHUCKERTWERKE AKT.-GES.
发明人
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
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