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经营范围
发明名称
ELECTRIC PULSE DRILLING TOOL
摘要
申请公布号
SU730022(A1)
申请公布日期
1987.12.30
申请号
SU19711533839
申请日期
1971.05.03
申请人
NII VYSOKIKH NAPRYAZH PRI
发明人
KALYATSKIJ I.I.,SU;SEMKIN B.V.,SU;SAFRONOV V.N.,SU
分类号
E21C37/18
主分类号
E21C37/18
代理机构
代理人
主权项
地址
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