Key pulsing sender for telephone systems,申请号US19400330158-传众专利搜索

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发明名称	Key pulsing sender for telephone systems
摘要
申请公布号	US2287613(A)	申请公布日期	1942.06.23
申请号	US19400330158	申请日期	1940.04.17
申请人	WESTERN ELECTRIC COMPANY, INCORPORATED	发明人	HARTLEY GEORGE C.;GRIFFITH GLYN D. H.
分类号	H04M1/272;H04Q3/00	主分类号	H04M1/272
代理机构		代理人
主权项
地址

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