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经营范围
发明名称
Mine stopping
摘要
申请公布号
USRE32871(E)
申请公布日期
1989.02.21
申请号
US19870092227
申请日期
1987.09.02
申请人
发明人
分类号
E21F1/14;E21F17/103
主分类号
E21F1/14
代理机构
代理人
主权项
地址
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