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发明名称
VERFAHREN ZUR HERSTELLUNG VON BOHRLOECHERN FUER FLACHGRUENDUNGEN
摘要
申请公布号
DD288426(A5)
申请公布日期
1991.03.28
申请号
DD19890333480
申请日期
1989.10.11
申请人
VEB VERKEHRS- U. TIEFBAUKOMBINAT FRANKFURT/O. ZENTRALE EBERSWALDE,DE
发明人
DANNEMANN,ERICH,DE;GOLLACK,HARALD,DE;HARRE,GUENTER,DE
分类号
E21B7/20;(IPC1-7):E21B7/20
主分类号
E21B7/20
代理机构
代理人
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