TELEPHONE AND SELECTIVE SIGNALING SYSTEMS,申请号CAD541601-传众专利搜索

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发明名称	TELEPHONE AND SELECTIVE SIGNALING SYSTEMS
摘要
申请公布号	CA541601(A)	申请公布日期	1957.05.28
申请号	CAD541601	申请日期
申请人	NORTHERN ELECTRIC COMPANY	发明人	CLARENCE J. DORR
分类号		主分类号
代理机构		代理人
主权项
地址

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