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发明名称
EXTRACTION ANNULAR DRILL BIT
摘要
申请公布号
CS251221(B1)
申请公布日期
1987.06.11
申请号
CS19820009885
申请日期
1982.12.28
申请人
NENKOV,NIKOLAJ D.,BG
发明人
NENKOV,NIKOLAJ D.,BG
分类号
E21B10/64;(IPC1-7):E21B10/64
主分类号
E21B10/64
代理机构
代理人
主权项
地址
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