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经营范围
发明名称
DETECTION CIRCUIT FOR OUTGOING CALL
摘要
PURPOSE:To perform current detection, to reject noise, and to increase the reliability of circuit, by connecting two photocouplers in loop, in the circuit monitoring the condition of the subscriber lines of a telephone exchanger.
申请公布号
JPS5439510(A)
申请公布日期
1979.03.27
申请号
JP19770105818
申请日期
1977.09.05
申请人
HITACHI LTD
发明人
TAKESHITA TETSUO
分类号
H04Q3/72;H04Q3/00
主分类号
H04Q3/72
代理机构
代理人
主权项
地址
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