Toll board time signal circuit,申请号US19530367843-传众专利搜索

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发明名称	Toll board time signal circuit
摘要
申请公布号	US2832831(A)	申请公布日期	1958.04.29
申请号	US19530367843	申请日期	1953.07.14
申请人	GENERAL TELEPHONE LABORATORIES, INCORPORATED	发明人	BELLIVEAU ALFRED H.
分类号	H04M3/12	主分类号	H04M3/12
代理机构		代理人
主权项
地址

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