METHOD OF BLOWING OF FLY-ASH FOR FILLING IN UNDERGROUND WORKS AND DEVICE FOR THAT METHOD APPLICATION,申请号PL19870269501-传众专利搜索

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发明名称	METHOD OF BLOWING OF FLY-ASH FOR FILLING IN UNDERGROUND WORKS AND DEVICE FOR THAT METHOD APPLICATION
摘要
申请公布号	PL157785(B1)	申请公布日期	1992.07.31
申请号	PL19870269501	申请日期	1987.12.16
申请人		发明人
分类号	E21F15/08;(IPC1-7):E21F15/00;E21F15/10	主分类号	E21F15/08
代理机构		代理人
主权项
地址

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