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发明名称
METHOD OF SIMULTANEOUS EXPLOITATION OF TWO BEDS OF A USEFUL MINERAL
摘要
申请公布号
PL114973(B2)
申请公布日期
1981.03.31
申请号
PL19790214486
申请日期
1979.03.27
申请人
发明人
分类号
E21C;E21C41/00;(IPC1-7):E21C41/00
主分类号
E21C
代理机构
代理人
主权项
地址
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