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经营范围
发明名称
RINGING COMPENSATION CIRCUIT
摘要
申请公布号
JPH03112276(A)
申请公布日期
1991.05.13
申请号
JP19890249135
申请日期
1989.09.27
申请人
HITACHI LTD
发明人
FUKINUKI NORIHIKO;ONISHI MAKOTO
分类号
H04N5/21;H04N9/00
主分类号
H04N5/21
代理机构
代理人
主权项
地址
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