Switching system for grouped telephone lines,申请号US19500147357-传众专利搜索

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发明名称	Switching system for grouped telephone lines
摘要
申请公布号	US2692917(A)	申请公布日期	1954.10.26
申请号	US19500147357	申请日期	1950.03.03
申请人	INTERNATIONAL STANDARD ELECTRIC CORPORATION	发明人	MAUGE MARCEL ROGER
分类号	H04Q1/18	主分类号	H04Q1/18
代理机构		代理人
主权项
地址

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