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发明名称
Vorrichtung zum Absaugen von Wettern an Arbeitsstellen unter Tage
摘要
申请公布号
DE881486(C)
申请公布日期
1953.06.29
申请号
DE1951S021595
申请日期
1951.01.20
申请人
SPRENGER JOSEF
发明人
SPRENGER JOSEF
分类号
E21F1/04
主分类号
E21F1/04
代理机构
代理人
主权项
地址
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