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发明名称
NOISE PREVENTING DEVICE FOR SPEECH LINE OF EXCHANGE
摘要
申请公布号
JPH03283859(A)
申请公布日期
1991.12.13
申请号
JP19900083514
申请日期
1990.03.30
申请人
NEC CORP;NEC TOHOKU LTD
发明人
ONIMARU FUMIO;KASHIYAMA YUKIHIRO
分类号
H04M3/22;H04M3/18
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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