Sprag Plates for Mine Roof Supports,申请号GB19790013866-传众专利搜索

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发明名称	Sprag Plates for Mine Roof Supports
摘要
申请公布号	GB2019476(A)	申请公布日期	1979.10.31
申请号	GB19790013866	申请日期	1979.04.20
申请人	HUWOOD LTD	发明人
分类号	E21D23/06;(IPC1-7):E21D23/00	主分类号	E21D23/06
代理机构		代理人
主权项
地址

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