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发明名称
KEGLIGE STUETZFLAECHEN AN KEGLIGEN GEWINDEVERBINDUNGEN FUER BOHRGESTAENGE
摘要
申请公布号
DD136278(A1)
申请公布日期
1979.06.27
申请号
DD19780203744
申请日期
1978.02.17
申请人
LOTZWICK,GERD,DD;SCHMALFELD,VINZENZ,DD;SWATON,WERNER,DD
发明人
LOTZWICK,GERD,DD;SCHMALFELD,VINZENZ,DD;SWATON,WERNER,DD
分类号
E21B17/042;(IPC1-7):E21B17/042
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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