Voice frequency signalling system,申请号GB19510000948-传众专利搜索

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发明名称	Voice frequency signalling system
摘要
申请公布号	GB696503(A)	申请公布日期	1953.09.02
申请号	GB19510000948	申请日期	1951.01.12
申请人	TELEFONAKTIEBOLAGET L M ERICSSON	发明人
分类号	H04Q1/453;H04Q3/00	主分类号	H04Q1/453
代理机构		代理人
主权项
地址

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