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发明名称
PRIVACY CIRCUIT IN KEY TELEPHONE UNIT
摘要
PURPOSE:To enable privacy function without eliminating each function of a key telephone system, by using a cable having very few number of core wires than conventional systems.
申请公布号
JPS5279705(A)
申请公布日期
1977.07.05
申请号
JP19750156724
申请日期
1975.12.26
申请人
IWASAKI TSUSHINKI KK
发明人
SEKIGUCHI KOUICHI
分类号
H04M1/70;H04M1/68;H04Q3/58
主分类号
H04M1/70
代理机构
代理人
主权项
地址
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