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发明名称
VORRICHTUNG ZUM UEBERLAGERUNGSBOHREN
摘要
申请公布号
DE1909931(B2)
申请公布日期
1977.06.16
申请号
DE19691909931
申请日期
1969.02.27
申请人
发明人
分类号
E21B4/06;E21B6/00;E21B7/20;(IPC1-7):E21C19/00;E21B7/00
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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