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发明名称
RINGER RELAY CONTROL SYSTEM FOR ELECTRONIC EXCHANGE
摘要
申请公布号
JPH03171958(A)
申请公布日期
1991.07.25
申请号
JP19890309375
申请日期
1989.11.30
申请人
NEC CORP
发明人
SUDO KAORU
分类号
H04M3/02
主分类号
H04M3/02
代理机构
代理人
主权项
地址
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