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发明名称
Improvements in arched support structures for mine galleries
摘要
申请公布号
GB777121(A)
申请公布日期
1957.06.19
申请号
GB19540011645
申请日期
1954.04.22
申请人
MARGOT VON LINSINGEN
发明人
分类号
E21D11/18
主分类号
E21D11/18
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代理人
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