GAS EXTRACTING SYSTEM FOR UNDERGROUND EXCAVATION WORKS,申请号PL19780205460-传众专利搜索

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发明名称	GAS EXTRACTING SYSTEM FOR UNDERGROUND EXCAVATION WORKS
摘要
申请公布号	PL114552(B1)	申请公布日期	1981.02.28
申请号	PL19780205460	申请日期	1978.03.21
申请人		发明人
分类号	B01D45/14;B04B1/10;(IPC1-7):E21D23/10	主分类号	B01D45/14
代理机构		代理人
主权项
地址

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