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经营范围
发明名称
MINE TUNNEL SUPPORT SYSTEMS
摘要
申请公布号
US5176474(A)
申请公布日期
1993.01.05
申请号
US19910784170
申请日期
1991.10.28
申请人
CALEDONIAN MINING CO. LTD.
发明人
MASON, BENJAMIN
分类号
E21D19/04
主分类号
E21D19/04
代理机构
代理人
主权项
地址
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