Ringing current generator switching circuit,申请号US19540440006-传众专利搜索

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发明名称	Ringing current generator switching circuit
摘要
申请公布号	US2851533(A)	申请公布日期	1958.09.09
申请号	US19540440006	申请日期	1954.06.29
申请人	GENERAL DYNAMICS CORPORATION	发明人	PHARIS WILLIAM W.
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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