ELECTRONIC DEVICE FOR TIMING TOLL CALLS AND FOR SIGNALLING BOTH SUBSCRIBER AND OPERATOR,申请号CAD490051-传众专利搜索

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发明名称	ELECTRONIC DEVICE FOR TIMING TOLL CALLS AND FOR SIGNALLING BOTH SUBSCRIBER AND OPERATOR
摘要
申请公布号	CA490051(A)	申请公布日期	1953.01.27
申请号	CAD490051	申请日期
申请人	NORTHERN ELECTRIC COMPANY	发明人	HAROLD J. MCCREARY
分类号		主分类号
代理机构		代理人
主权项
地址

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