| 发明名称 |
CONTROL DEVICE OF TELEPHONE CALL CURRENT SUPPLY |
| 摘要 |
<p>PURPOSE:To improve the bad influence due to the external inductive noise by electrically insulating between the control circuit of the switchboard equipment and the terminal telephone set in case of the telephone on the train.</p> |
| 申请公布号 |
JPS52142905(A) |
申请公布日期 |
1977.11.29 |
| 申请号 |
JP19760059096 |
申请日期 |
1976.05.24 |
| 申请人 |
HITACHI ELECTRONICS |
发明人 |
TAKARAKAWA TAKUYA;MIZUGUCHI SUSUMU |
| 分类号 |
H04M9/00;H04M19/00;(IPC1-7):04M9/00 |
主分类号 |
H04M9/00 |
| 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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