| 发明名称 |
PUSHHBUTTON DIAL FEATURING TRANSMISSIN PREVENTING FUNCTION FOR SPECIFI ED NUMBER |
| 摘要 |
PURPOSE:The frequency contact constituting tuning circuit of push-button dial is replaced with transistor, and further photoelectric element being utilized. Thus, transmission preventing function is secured for specified number. |
| 申请公布号 |
JPS5246704(A) |
申请公布日期 |
1977.04.13 |
| 申请号 |
JP19750122758 |
申请日期 |
1975.10.11 |
| 申请人 |
IWASAKI TSUSHINKI KK |
发明人 |
KOBAYASHI AKIHIRO;MOCHIDA MASAYUKI |
| 分类号 |
H04M1/50;H04M1/66;H04M1/67 |
主分类号 |
H04M1/50 |
| 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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