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发明名称
DEVICE FOR REDUCING DRILLING UNIT NOISE
摘要
申请公布号
SU794218(A1)
申请公布日期
1981.01.07
申请号
SU19792707619
申请日期
1979.01.04
申请人
SP KT BYURO I GEOTEKHNICHESKOJ MEKHANIKI AN UK SSR
发明人
NESTERENKO VLADIMIR ,SU;BERGELSON VALENTINA N,SU;FEDOSKINA OLGA T,SU;KHOLYAVCHENKO LEONID T,SU
分类号
E21B6/04;B25D17/12;E21B1/00;(IPC1-7):E21C3/24
主分类号
E21B6/04
代理机构
代理人
主权项
地址
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