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发明名称
Verfahren und Vorrichtung zum Tiefbohren
摘要
申请公布号
DE806245(C)
申请公布日期
1951.06.11
申请号
DE1948P018790
申请日期
1948.10.19
申请人
OTTO FRUEHLING
发明人
FRUEHLING OTTO
分类号
E21B4/06
主分类号
E21B4/06
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代理人
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