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发明名称
UNDERGROUND MINING PROCESS USING DOWNWARDLY DIRECTED STOPING AND CAVING, AND INSTALLATION FOR CARRYING THIS OUT
摘要
申请公布号
EP0250286(B1)
申请公布日期
1991.09.11
申请号
EP19870401218
申请日期
1987.06.01
申请人
CHARBONNAGES DE FRANCE
发明人
MARION, RENE ANDRE
分类号
E21C41/00;E21C41/16;E21C41/18;E21D19/02;E21D23/00
主分类号
E21C41/00
代理机构
代理人
主权项
地址
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