| 发明名称 |
ALARM SENDING SYSTEM |
| 摘要 |
PURPOSE:To make it possible to make fault transmission by using the trunk line between the exchanges for the general telephone call for both transmission and reception which uses the pulse system line signal. |
| 申请公布号 |
JPS52151505(A) |
申请公布日期 |
1977.12.16 |
| 申请号 |
JP19760067719 |
申请日期 |
1976.06.11 |
| 申请人 |
HITACHI LTD |
发明人 |
KONDOU YOSHIHARU;MINOSHIMA TSUTOMU |
| 分类号 |
H04M3/22;H04M3/08;(IPC1-7):04M3/08 |
主分类号 |
H04M3/22 |
| 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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