VIDEOTELEPHONE SYSTEM FOR PROVIDING A VISUAL DISPLAY OF CALL PROGRESS SIGNALS,申请号CAD839878-传众专利搜索

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发明名称	VIDEOTELEPHONE SYSTEM FOR PROVIDING A VISUAL DISPLAY OF CALL PROGRESS SIGNALS
摘要
申请公布号	CA839878(A)	申请公布日期	1970.04.21
申请号	CAD839878	申请日期
申请人	WESTERN ELECTRIC COMPANY, INCORPORATED	发明人	BARRY LITOFSKY
分类号		主分类号
代理机构		代理人
主权项
地址

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