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发明名称
Wandernder Ausbau zur Sicherung des Hangenden bei der Kohlengewinnung
摘要
申请公布号
DE802248(C)
申请公布日期
1951.02.05
申请号
DE1948P009267
申请日期
1948.10.02
申请人
SCHMIDT ALEXANDER DR.-ING.
发明人
SCHMIDT ALEXANDER DR.-ING.
分类号
E21D17/00
主分类号
E21D17/00
代理机构
代理人
主权项
地址
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