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发明名称
DEVICE FOR FORMING DIRECTIONAL CRACKS IN BOREHOLES
摘要
申请公布号
SU1573171(A1)
申请公布日期
1990.06.23
申请号
SU19884426865
申请日期
1988.05.13
申请人
INST GORNOGO DELA SO AN SSSR
发明人
KYU NIKOLAJ G,SU;CHERNOV OLEG I,SU;SHABALIN IVAN V,SU;SHEPELEV LEV N,SU
分类号
E21C37/06;E21B43/26
主分类号
E21C37/06
代理机构
代理人
主权项
地址
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