Apparatus for mine roof control,申请号US19560588773-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	US2826898(A)	申请公布日期	1958.03.18
申请号	US19560588773	申请日期	1956.06.01
申请人	JOY MANUFACTURING COMPANY	发明人	JOY JOSEPH F.
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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