| 发明名称 |
AUXILIARY POWER SUPPLY SWITCHING TYPE CURRENT SWITCHING SCANNING METHO D |
| 摘要 |
PURPOSE:To switch to an auxiliary power supply to prevent misdetection of originating call in an occasion of failure and to improve the reliability of the device by doubling the rectifier on the driver side of a matrix circuit in an automatic telephone exchange. |
| 申请公布号 |
JPS52101904(A) |
申请公布日期 |
1977.08.26 |
| 申请号 |
JP19760017930 |
申请日期 |
1976.02.23 |
| 申请人 |
HITACHI LTD;NIPPON TELEGRAPH & TELEPHONE |
发明人 |
SATOU ISAO;INOUE KOUJI;UENO TAKAO;ISHIZAWA AKIRA |
| 分类号 |
H04Q3/72;H04Q3/00 |
主分类号 |
H04Q3/72 |
| 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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