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经营范围
发明名称
Procédé d'aspiration du grisou dans l'exploitation des mines
摘要
申请公布号
FR1072231(A)
申请公布日期
1954.09.09
申请号
FRD1072231
申请日期
1953.03.05
申请人
发明人
GREMMLER EWALD
分类号
E21F7/00
主分类号
E21F7/00
代理机构
代理人
主权项
地址
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