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发明名称
DIAGNOSTIC SYSTEM FOR IN-BAND RINGER SUBSCRIBER
摘要
申请公布号
JPH04162862(A)
申请公布日期
1992.06.08
申请号
JP19900289748
申请日期
1990.10.25
申请人
NEC CORP;NEC COMMUN SYST LTD
发明人
MIZUGUCHI TADASHI;TANEMURA KAORU
分类号
H04M3/26
主分类号
H04M3/26
代理机构
代理人
主权项
地址
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