ROOF BAR OF A MINE ROOF SUPPORT FOR CORRIDOR-TYPE MINE DRIFTS,申请号PL19790217335-传众专利搜索

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发明名称	ROOF BAR OF A MINE ROOF SUPPORT FOR CORRIDOR-TYPE MINE DRIFTS
摘要
申请公布号	PL121113(B1)	申请公布日期	1982.04.30
申请号	PL19790217335	申请日期	1979.07.23
申请人		发明人
分类号	E21D;E21D11/14;(IPC1-7):E21D11/14	主分类号	E21D
代理机构		代理人
主权项
地址

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