Method and apparatus for driving tunnels and headings,申请号GB19300014385-传众专利搜索

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发明名称	Method and apparatus for driving tunnels and headings
摘要
申请公布号	GB357196(A)	申请公布日期	1931.09.09
申请号	GB19300014385	申请日期	1930.05.09
申请人	HANS SCHAEFER	发明人
分类号	E21D9/06	主分类号	E21D9/06
代理机构		代理人
主权项
地址

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