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发明名称
FEDERZENTRALISATOR FUER ROHRE BEI ENGEN RINGRAUMVERHAELTNISSEN IN DER TIEFBOHRTECHNIK
摘要
申请公布号
DD148898(A3)
申请公布日期
1981.06.17
申请号
DD19790211998
申请日期
1979.04.04
申请人
DREIBRODT,HERMANN,DD;TRAMPE,FRED,DD
发明人
DREIBRODT,HERMANN,DD;TRAMPE,FRED,DD
分类号
E21B17/10;(IPC1-7):E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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