发明名称 |
MONITOR SYSTEM FOR SUBSCRIBER TELEPHONE |
摘要 |
PURPOSE:To secure the monitoring for the called party's reply in a simplw way, by connecting terminal T to-L line connecting between the subscriber telephone and the automatic exchange unit and then inserting the serial circuit of the relay, diode and relay contact and terminal T. |
申请公布号 |
JPS5423407(A) |
申请公布日期 |
1979.02.22 |
申请号 |
JP19770088426 |
申请日期 |
1977.07.25 |
申请人 |
NIPPON TELEGRAPH & TELEPHONE;NIPPO TSUSHIN KOGYO KK |
发明人 |
YAMAZAKI HIROSHI;MIYAMOTO MAKOTO;YANAGIMOTO TAKAHITO;SUZUKI SHINICHI |
分类号 |
H04M3/36;H04M3/30 |
主分类号 |
H04M3/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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