Improvements relating to Roof Supports for Mine Workings,申请号GB19660055751-传众专利搜索

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发明名称	Improvements relating to Roof Supports for Mine Workings
摘要
申请公布号	GB1168795(A)	申请公布日期	1969.10.29
申请号	GB19660055751	申请日期	1966.04.21
申请人	KARL MARIA GROETSCHEL	发明人	KARL MARIA GROETSCHEL
分类号	E21D23/00	主分类号	E21D23/00
代理机构		代理人
主权项
地址

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