TELEPHONE SIGNALLING SYSTEM,申请号CAD309969-传众专利搜索

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发明名称	TELEPHONE SIGNALLING SYSTEM
摘要
申请公布号	CA309969(A)	申请公布日期	1931.03.31
申请号	CAD309969	申请日期
申请人	THE WESTERN ELECTRIC COMPANY	发明人	ELIOT WRIGHT NILES;WILLIAM HOPPLE EDWARDS
分类号		主分类号
代理机构		代理人
主权项
地址

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