| 发明名称 |
PRIVACY CALL CIRCUIT OF BUTTOM TELEPHON DEVICE |
| 摘要 |
PURPOSE:To attempt to decrease the cable core in the button telephone device by realizing the privacy call circuit by common use of power supply line and control line. |
| 申请公布号 |
JPS5373010(A) |
申请公布日期 |
1978.06.29 |
| 申请号 |
JP19760149610 |
申请日期 |
1976.12.13 |
| 申请人 |
IWATSU ELECTRIC CO LTD |
发明人 |
SEKIGUCHI KOUICHI;TAKANO JIYUICHI |
| 分类号 |
H04M1/70;H04M1/68;H04Q3/58 |
主分类号 |
H04M1/70 |
| 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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