All relay system in which local called telephone line is fed talking battery from connector or repeater,申请号US19470762750-传众专利搜索

发明名称	All relay system in which local called telephone line is fed talking battery from connector or repeater
摘要
申请公布号	US2522720(A)	申请公布日期	1950.09.19
申请号	US19470762750	申请日期	1947.07.22
申请人	AUTOMATIC ELECTRIC LABORATORIES, INC.	发明人	JONES ROY W.
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址