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发明名称
RING TRIP CIRCUIT
摘要
申请公布号
JPH01158861(A)
申请公布日期
1989.06.21
申请号
JP19870317979
申请日期
1987.12.15
申请人
NEC CORP
发明人
UNZAI MINORU
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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