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发明名称
Dispositif d'étayage du toit pour le soutènement marchant mécanisé des galeries d'extraction
摘要
申请公布号
FR1514945(A)
申请公布日期
1968.03.01
申请号
FR19660058286
申请日期
1966.04.20
申请人
发明人
GROETSCHEL KARL MARIA
分类号
E21D23/04
主分类号
E21D23/04
代理机构
代理人
主权项
地址
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