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发明名称
DRILLING BIT
摘要
申请公布号
SU844759(A1)
申请公布日期
1981.07.07
申请号
SU19792761803
申请日期
1979.04.26
申请人
NI GORNORUDNYJ INSTITUT
发明人
CHERNENKO ALEKSANDR R,SU;MINENKO PAVEL A,SU
分类号
E21B10/46;(IPC1-7):E21B10/46
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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