Steel pit prop,申请号GB19490031986-传众专利搜索

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发明名称	Steel pit prop
摘要
申请公布号	GB683541(A)	申请公布日期	1952.12.03
申请号	GB19490031986	申请日期	1949.12.13
申请人	RINGFEDER G.M.B.H.	发明人
分类号	E21D15/32	主分类号	E21D15/32
代理机构		代理人
主权项
地址

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