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经营范围
发明名称
DIRECTED DRILLING TOOL
摘要
申请公布号
SU848558(A1)
申请公布日期
1981.07.23
申请号
SU19792777144
申请日期
1979.06.07
申请人
DO POLT INSTITUT
发明人
YUSHKOV ALEKSANDR S,SU;KOKHANOVSKIJ ALEKSANDR A,SU
分类号
E21B7/08;(IPC1-7):E21B7/08
主分类号
E21B7/08
代理机构
代理人
主权项
地址
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