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经营范围
发明名称
Dispositif pour la fermeture des galeries de mines
摘要
申请公布号
FR680198(A)
申请公布日期
1930.04.25
申请号
FRD680198
申请日期
1929.08.12
申请人
发明人
HOFER HANS
分类号
E21F17/103
主分类号
E21F17/103
代理机构
代理人
主权项
地址
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