Improvements in telegraph exchange systems,申请号GB19340032131-传众专利搜索

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发明名称	Improvements in telegraph exchange systems
摘要
申请公布号	GB430295(A)	申请公布日期	1935.06.17
申请号	GB19340032131	申请日期	1934.11.08
申请人		发明人
分类号	H04L12/14	主分类号	H04L12/14
代理机构		代理人
主权项
地址

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