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发明名称
Verfahren und Vorrichtung zur Gewinnung von Braunkohlen unter dem Schutze einer Abbaukammer
摘要
申请公布号
DE831688(C)
申请公布日期
1952.02.18
申请号
DE1949P053408
申请日期
1949.08.31
申请人
ARTHUR HAMEL
发明人
HAMEL ALBERT
分类号
E21D19/02
主分类号
E21D19/02
代理机构
代理人
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地址
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