Tunnelling between levels,申请号GB19790031270-传众专利搜索

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发明名称	Tunnelling between levels
摘要
申请公布号	GB2030196(A)	申请公布日期	1980.04.02
申请号	GB19790031270	申请日期	1979.09.10
申请人	EDENVALE ENG WORKS LTD	发明人
分类号	E21C41/16;E21D3/00;E21D9/00;(IPC1-7):E21D3/00	主分类号	E21C41/16
代理机构		代理人
主权项
地址

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