Method and apparatus for the winning of coal from seams with soft floors,申请号GB19670006920-传众专利搜索

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发明名称	Method and apparatus for the winning of coal from seams with soft floors
摘要
申请公布号	GB1149714(A)	申请公布日期	1969.04.23
申请号	GB19670006920	申请日期	1967.02.14
申请人	GEWERKSCHAFT EISENHUETTE WESTFALIA	发明人
分类号	E21C27/18	主分类号	E21C27/18
代理机构		代理人
主权项
地址

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