Improvements in or relating to communication systems for mining installations,申请号GB19560005827-传众专利搜索

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发明名称	Improvements in or relating to communication systems for mining installations
摘要
申请公布号	GB798815(A)	申请公布日期	1958.07.30
申请号	GB19560005827	申请日期	1956.02.24
申请人	CARL LUDWIG LEHNER	发明人
分类号	E21F17/18	主分类号	E21F17/18
代理机构		代理人
主权项
地址

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