Crossbar tandem office for telephone systems,申请号US19480060503-传众专利搜索

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发明名称	Crossbar tandem office for telephone systems
摘要
申请公布号	US2559312(A)	申请公布日期	1951.07.03
申请号	US19480060503	申请日期	1948.11.17
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	NEWSOM JAMES B.
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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