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发明名称
Improvements in or relating to drift support systems for mines
摘要
申请公布号
GB774574(A)
申请公布日期
1957.05.15
申请号
GB19520027416
申请日期
1952.10.31
申请人
ARNOLD HAARMANN
发明人
分类号
E21D11/22
主分类号
E21D11/22
代理机构
代理人
主权项
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