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经营范围
发明名称
Vorrichtung zur mechanischen Kohlengewinnung
摘要
申请公布号
DE576955(C)
申请公布日期
1933.05.19
申请号
DE1932K125380D
申请日期
1932.05.10
申请人
FRANZ KALLA;PAUL KALLA
发明人
分类号
E21C25/64
主分类号
E21C25/64
代理机构
代理人
主权项
地址
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