Automatic telephone exchange,申请号US19520276252-传众专利搜索

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发明名称	Automatic telephone exchange
摘要
申请公布号	US2767250(A)	申请公布日期	1956.10.16
申请号	US19520276252	申请日期	1952.03.13
申请人	NORTH ELECTRIC COMPANY	发明人	BLACKHALL JAMES M.;BLASHFIELD WILLIAM H.;SIMMONS DORSEY D.;RYON MAURICE G.;CROW CLARENCE C.
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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