Carrier current telephone apparatus,申请号US19460655071-传众专利搜索

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发明名称	Carrier current telephone apparatus
摘要
申请公布号	US2432560(A)	申请公布日期	1947.12.16
申请号	US19460655071	申请日期	1946.03.18
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	CROOKS RALPH K.
分类号	H04J1/00	主分类号	H04J1/00
代理机构		代理人
主权项
地址

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