Telephone ringing generator,申请号US19490118543-传众专利搜索

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发明名称	Telephone ringing generator
摘要
申请公布号	US2557953(A)	申请公布日期	1951.06.26
申请号	US19490118543	申请日期	1949.09.29
申请人	FEDERAL TELEPHONE AND RADIO CORPORATION	发明人	DURON ANTONIO P.
分类号	H02K21/16	主分类号	H02K21/16
代理机构		代理人
主权项
地址

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