Antisidetone and line balancing substation circuits for telephone systems,申请号US19470784278-传众专利搜索

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发明名称	Antisidetone and line balancing substation circuits for telephone systems
摘要
申请公布号	US2518178(A)	申请公布日期	1950.08.08
申请号	US19470784278	申请日期	1947.11.05
申请人	AUTOMATIC ELECTRIC LABORATORIES, INC.	发明人	PYE HAROLD C.
分类号	H04B1/58;H04M1/58	主分类号	H04B1/58
代理机构		代理人
主权项
地址

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