METHOD OF DRIVING LONGWALL HEADINGS,申请号PL19850254547-传众专利搜索

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发明名称	METHOD OF DRIVING LONGWALL HEADINGS
摘要
申请公布号	PL141459(B2)	申请公布日期	1987.07.31
申请号	PL19850254547	申请日期	1985.07.15
申请人		发明人
分类号	E21F;E21F15/08;(IPC1-7):E21F15/08	主分类号	E21F
代理机构		代理人
主权项
地址

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