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发明名称
METHOD OF UNDERGROUND MINING
摘要
申请公布号
PT65353(B)
申请公布日期
1978.01.09
申请号
PT19760065353
申请日期
1976.07.09
申请人
CANADIAN INDUSTRIES LIMITED
发明人
分类号
E21C41/16;E21C41/22;E21D9/00;E21D13/00;F42D1/00
主分类号
E21C41/16
代理机构
代理人
主权项
地址
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