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发明名称
METHOD FOR MINING THICK COAL DEPOSITS,ESPECIALLY RESIDUAL DEPOSITS,ESPECIALLY ENDANGERED BY CRUMPING
摘要
申请公布号
PL265663(A1)
申请公布日期
1988.12.22
申请号
PL19870265663
申请日期
1987.05.13
申请人
发明人
分类号
E21C;E21C41/18;(IPC1-7):E21C/
主分类号
E21C
代理机构
代理人
主权项
地址
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