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发明名称
(B1) ;METHOD OF EXTRACTING COAL DEPOSITS
摘要
申请公布号
PL230667(A1)
申请公布日期
1981.12.23
申请号
PL19810230667
申请日期
1981.04.13
申请人
TATABANYAI SZENBANYAK
发明人
分类号
E21C;E21C41/00;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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