Material lock for tunnels,申请号US19390260701-传众专利搜索

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发明名称	Material lock for tunnels
摘要
申请公布号	US2190064(A)	申请公布日期	1940.02.13
申请号	US19390260701	申请日期	1939.03.09
申请人	GOODER SETH M	发明人	GOODER SETH M.
分类号	E21D9/12	主分类号	E21D9/12
代理机构		代理人
主权项
地址

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