Switching system using momentary onhook signalling in answered trunk to detect abandoned call,申请号US19640362672-传众专利搜索

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发明名称	Switching system using momentary onhook signalling in answered trunk to detect abandoned call
摘要
申请公布号	US3335231(A)	申请公布日期	1967.08.08
申请号	US19640362672	申请日期	1964.04.27
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	GRAY PRESTON R.;WEDDING PAUL L.
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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