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发明名称
Système de soutènement des tailles ou voies particulièrement applicable aux exploitations minières
摘要
申请公布号
FR1017459(A)
申请公布日期
1952.12.11
申请号
FRD1017459
申请日期
1950.05.12
申请人
发明人
GROETSCHEL KARL MARIA
分类号
E21D15/54;E21D17/10
主分类号
E21D15/54
代理机构
代理人
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