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经营范围
发明名称
METHOD OF WORKING THICK GENTLY SLOPING COAL BEDS
摘要
申请公布号
SU831975(A1)
申请公布日期
1981.05.23
申请号
SU19782668275
申请日期
1978.10.02
申请人
DO NI UGOLNYJ INSTITUT
发明人
PROYAVKIN EVGENIJ T,SU
分类号
(IPC1-7):E21C41/04
主分类号
(IPC1-7):E21C41/04
代理机构
代理人
主权项
地址
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