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发明名称
Verfahren und Einrichtung zur Erhoehung der Leistung beim Abbau von Floezen, insbesondere solcher steiler und halbsteiler Lagerung
摘要
申请公布号
DE815781(C)
申请公布日期
1951.10.04
申请号
DE1950G001079
申请日期
1950.02.16
申请人
GELSENKIRCHENER BERGWERKS-AKTIEN-GESELLSCHAFT
发明人
NIERMANN FRITZ
分类号
E21C25/06
主分类号
E21C25/06
代理机构
代理人
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