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经营范围
发明名称
Equipment for Laying a Layer of Elongate Material Adjacent to a Newly Exposed Mine Roof
摘要
申请公布号
GB2030615(A)
申请公布日期
1980.04.10
申请号
GB19780043502
申请日期
1978.11.07
申请人
COAL INDUSTRY LTD
发明人
分类号
E21C25/14;E21C35/00;E21D19/02;(IPC1-7):E21C35/00
主分类号
E21C25/14
代理机构
代理人
主权项
地址
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