Improvements in or relating to electrical signalling systems,申请号GB19310010887-传众专利搜索

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发明名称	Improvements in or relating to electrical signalling systems
摘要
申请公布号	GB376754(A)	申请公布日期	1932.07.13
申请号	GB19310010887	申请日期	1931.04.13
申请人	ASSOCIATED TELEPHONE & TELEGRAPH COMPANY	发明人
分类号	H04L12/18	主分类号	H04L12/18
代理机构		代理人
主权项
地址

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