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发明名称
Langfrontabbauverfahren fuer maechtige Kohlenfloeze
摘要
申请公布号
DE679635(C)
申请公布日期
1939.08.11
申请号
DE1938D077304D
申请日期
1938.02.16
申请人
DR.-ING. LEO DUBIEL
发明人
DUBIEL DR.-ING. LEO
分类号
E21C41/18
主分类号
E21C41/18
代理机构
代理人
主权项
地址
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