METHOD OF PROTECTING ROOF BEHIND A SELF ADVANCING ROOF SUPPORT AND APPARATUS THEREFOR,申请号PL19840247352-传众专利搜索

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发明名称	METHOD OF PROTECTING ROOF BEHIND A SELF ADVANCING ROOF SUPPORT AND APPARATUS THEREFOR
摘要
申请公布号	PL142201(B1)	申请公布日期	1987.09.30
申请号	PL19840247352	申请日期	1984.04.19
申请人		发明人
分类号	E21D;E21D23/03;E21F15/02;(IPC1-7):E21F15/02	主分类号	E21D
代理机构		代理人
主权项
地址

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