ARRANGEMENT OF MINING EXCAVATIONS IN METHANE ENDANGERED AREAS,申请号PL19780211254-传众专利搜索

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发明名称	ARRANGEMENT OF MINING EXCAVATIONS IN METHANE ENDANGERED AREAS
摘要
申请公布号	PL120887(B1)	申请公布日期	1982.03.31
申请号	PL19780211254	申请日期	1978.11.25
申请人		发明人
分类号	E21F;E21F1/08;(IPC1-7):E21F1/08	主分类号	E21F
代理机构		代理人
主权项
地址

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