| 发明名称 |
TRANSMISSION SYSTEM FOR CHARGING SIGNAL |
| 摘要 |
PURPOSE:To prevent the changeover of the communication path at charging signal transmission and to avoid the momentary interruption of the communication signal, by keeping duplicated communication path with floating power supplies between a trunk and public telephone sets. |
| 申请公布号 |
JPS53147411(A) |
申请公布日期 |
1978.12.22 |
| 申请号 |
JP19770061233 |
申请日期 |
1977.05.27 |
| 申请人 |
HITACHI LTD;NIPPON TELEGRAPH & TELEPHONE |
发明人 |
MIYOSHI SHIGE;MUKAEMACHI TAKUJI;KIKUCHI AKIRA;YASUI NAOHIKO |
| 分类号 |
H04M15/00;H04M17/00;H04Q3/52 |
主分类号 |
H04M15/00 |
| 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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