发明名称 |
PRIVACY SYSTEM FOR KEY TELEPHONE SYSTEM |
摘要 |
PURPOSE:To minimize the size of the key telephone system by reducing the number of the cable core through application of time-division multiple system to the control line and the channel of the key telephone system and packaging the trunk privacy circuit into the main equipment. |
申请公布号 |
JPS5410605(A) |
申请公布日期 |
1979.01.26 |
申请号 |
JP19770074931 |
申请日期 |
1977.06.25 |
申请人 |
IWATSU ELECTRIC CO LTD |
发明人 |
SEKIGUCHI KOUICHI;KATSUKURA KAZUTADA;TAKEMATSU HIKARI |
分类号 |
H04Q3/58;H04M9/02;H04Q11/04 |
主分类号 |
H04Q3/58 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|