Voice frequency signalling system,申请号GB19640051132-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	GB1019410(A)	申请公布日期	1966.02.09
申请号	GB19640051132	申请日期	1964.12.16
申请人	WESTERN ELECTRIC COMPANY, INCORPORATED	发明人
分类号	H04Q1/446	主分类号	H04Q1/446
代理机构		代理人
主权项
地址

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