ELECTRONIC TELEPHONE EXCHANGE SYSTEM,申请号CAD507381-传众专利搜索

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发明名称	ELECTRONIC TELEPHONE EXCHANGE SYSTEM
摘要
申请公布号	CA507381(A)	申请公布日期	1954.11.16
申请号	CAD507381	申请日期
申请人	INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION	发明人	DAVID H. RANSOM
分类号		主分类号
代理机构		代理人
主权项
地址

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