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发明名称
SPEECH QUALITY MEASURING SYSTEM FOR TELEPHONE EXCHANGE
摘要
申请公布号
JPH0391349(A)
申请公布日期
1991.04.16
申请号
JP19890228821
申请日期
1989.09.04
申请人
NEC CORP
发明人
OTAKE KIYOMI
分类号
H04M3/22
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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