Supervisory signaling in telephone or like switching systems,申请号US19450603684-传众专利搜索

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发明名称	Supervisory signaling in telephone or like switching systems
摘要
申请公布号	US2468299(A)	申请公布日期	1949.04.26
申请号	US19450603684	申请日期	1945.07.07
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	MALONEY MARTIN E.
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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