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发明名称
DEVICE FR DIRECTIONAL DRILLING OF VERTICAL BLAST HOLES
摘要
申请公布号
SU804827(A1)
申请公布日期
1981.02.15
申请号
SU19782639711
申请日期
1978.06.06
申请人
SIBIRSKIJ G PNII TSVETNOJ METALLURGII
发明人
SIFORKIN VIKTOR K,SU;KRUGLOV ALEKSANDR N,SU;BOJTSOV NIKOLAJ P,SU
分类号
E21B19/24;(IPC1-7):E21C9/00
主分类号
E21B19/24
代理机构
代理人
主权项
地址
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