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发明名称
Installing tunnel roof supports
摘要
申请公布号
GB2071180(A)
申请公布日期
1981.09.16
申请号
GB19810006815
申请日期
1981.03.04
申请人
HARDING J D
发明人
分类号
E21D11/40;(IPC1-7):E21D11/40
主分类号
E21D11/40
代理机构
代理人
主权项
地址
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