Electrical signaling system,申请号US19380205661-传众专利搜索

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发明名称	Electrical signaling system
摘要
申请公布号	US2212721(A)	申请公布日期	1940.08.27
申请号	US19380205661	申请日期	1938.05.02
申请人	ASSOCIATED TELEPHONE & TELEGRAPH COMPANY	发明人	TERRONI TESEO BRUNO DANTE
分类号	H02J13/00;H04Q1/442	主分类号	H02J13/00
代理机构		代理人
主权项
地址

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