Telephone identification circuit,申请号US19490089750-传众专利搜索

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发明名称	Telephone identification circuit
摘要
申请公布号	US2550585(A)	申请公布日期	1951.04.24
申请号	US19490089750	申请日期	1949.04.26
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	MURPHY RICHARD P.
分类号	H04M15/08	主分类号	H04M15/08
代理机构		代理人
主权项
地址

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