METHOD OF PROTECTING AT-THE-SHAFT AND FIELD GOTTEN BUNKERS AGAINST EXPLOSION OF COAL DUST,申请号PL19870265274-传众专利搜索

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发明名称	METHOD OF PROTECTING AT-THE-SHAFT AND FIELD GOTTEN BUNKERS AGAINST EXPLOSION OF COAL DUST
摘要
申请公布号	PL265274(A1)	申请公布日期	1988.03.03
申请号	PL19870265274	申请日期	1987.04.17
申请人		发明人
分类号	E21F;E21F5/00;E21F5/08;(IPC1-7):E21F/	主分类号	E21F
代理机构		代理人
主权项
地址

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