MECHANIZED ROOF SUPPORT ADVANCEMENT SYSTEM,申请号PL19830244566-传众专利搜索

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发明名称	MECHANIZED ROOF SUPPORT ADVANCEMENT SYSTEM
摘要
申请公布号	PL141896(B1)	申请公布日期	1987.09.30
申请号	PL19830244566	申请日期	1983.11.14
申请人		发明人
分类号	E21D;E21D23/08;(IPC1-7):E21D23/08	主分类号	E21D
代理机构		代理人
主权项
地址

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