Improvements in frame-coal cutters,申请号GB19490016074-传众专利搜索

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发明名称	Improvements in frame-coal cutters
摘要
申请公布号	GB668322(A)	申请公布日期	1952.03.12
申请号	GB19490016074	申请日期	1949.06.16
申请人	DEUTSCHE KOHLENBERGBAU-LEITUNG	发明人
分类号	E21C27/04	主分类号	E21C27/04
代理机构		代理人
主权项
地址

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