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经营范围
发明名称
Setting mine roof arches
摘要
申请公布号
GB2223044(A)
申请公布日期
1990.03.28
申请号
GB19880022364
申请日期
1988.09.22
申请人
* COAL INDUSTRY
发明人
RODNEY VINCENT * NICHOLS
分类号
E21D11/40
主分类号
E21D11/40
代理机构
代理人
主权项
地址
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