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经营范围
发明名称
ECHO CANCELLER
摘要
申请公布号
JPH05218903(A)
申请公布日期
1993.08.27
申请号
JP19920000451
申请日期
1992.01.07
申请人
NEC CORP
发明人
YASUDA SUSUMU
分类号
H04B3/23
主分类号
H04B3/23
代理机构
代理人
主权项
地址
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