| 发明名称 |
DISPLAY AND DISCRIMINATION SYSTEM FOR TELEPHONE STATE |
| 摘要 |
PURPOSE:To display the state during day and night without providing a special relay in the subscriber's circuit and make it possible to discriminate automatically the state by the exchange, by adding a state display means to an extension telephone set. |
| 申请公布号 |
JPS53116712(A) |
申请公布日期 |
1978.10.12 |
| 申请号 |
JP19770031789 |
申请日期 |
1977.03.22 |
| 申请人 |
FUJITSU LTD |
发明人 |
NAKAYAMA KIYOAKI;OOSONE HISAO;SATOU AKIO;SEKIGUCHI JIROU |
| 分类号 |
H04M3/42;H04Q3/58;H04Q3/72 |
主分类号 |
H04M3/42 |
| 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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