Apparatus for mine roof control,申请号GB19520026960-传众专利搜索

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发明名称	Apparatus for mine roof control
摘要
申请公布号	GB706088(A)	申请公布日期	1954.03.24
申请号	GB19520026960	申请日期	1948.06.18
申请人	JOY MANUFACTURING COMPANY	发明人
分类号	E21D23/08	主分类号	E21D23/08
代理机构		代理人
主权项
地址

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