METHOD OF PROVIDING DIALTONE FIRST ON STEP BY STEP TELEPHONE SYSTEMS,申请号CA19740210325-传众专利搜索

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发明名称	METHOD OF PROVIDING DIALTONE FIRST ON STEP BY STEP TELEPHONE SYSTEMS
摘要
申请公布号	CA1026446(A)	申请公布日期	1978.02.14
申请号	CA19740210325	申请日期	1974.09.30
申请人	NORTHERN ELECTRIC COMPANY LIMITED	发明人	DEGRAAUW, HENK A.;BASHYAM, RAMASWAMI
分类号		主分类号
代理机构		代理人
主权项
地址

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