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发明名称
SPOSOB WYBIERANIA GRUBYCH POKLADOW WEGLA O DUZYM NACHYLENIU WARSTWAMI POZIOMYMI Z ZAWALEM STROPU
摘要
申请公布号
PL95923(B1)
申请公布日期
1977.11.30
申请号
PL19750183494
申请日期
1975.09.22
申请人
发明人
分类号
(IPC1-7):E21C41/04
主分类号
(IPC1-7):E21C41/04
代理机构
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