| 发明名称 |
Key telephone line circuit with improved hold circuit |
| 摘要 |
The line circuit of the invention uses only two multiple contact relays. The hold function is controlled with a reed relay having a single contact pair as well as three diodes whereas the line relay is only required to have a single contact pair.
|
| 申请公布号 |
US4445004(A) |
申请公布日期 |
1984.04.24 |
| 申请号 |
US19820381080 |
申请日期 |
1982.05.24 |
| 申请人 |
NORTHERN TELECOM LIMITED |
发明人 |
HO, PAUL Y. |
| 分类号 |
H04M9/00;(IPC1-7):H04Q5/18 |
主分类号 |
H04M9/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
