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发明名称
SPOSOB WYKONYWANIA OBROTOWEGO SWIDRA GRYZAKOWEGO
摘要
申请公布号
PL206824(A1)
申请公布日期
1979.02.12
申请号
PL19780206824
申请日期
1978.05.16
申请人
DRESSER IND
发明人
分类号
E21B;(IPC1-7):E21B/
主分类号
E21B
代理机构
代理人
主权项
地址
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