| 发明名称 |
PRIVACY CIRCUIT OF TELEPHONE |
| 摘要 |
PURPOSE:To realize parent-child telephone featuring private talk transfer with simple circuit structure by adding privacy circuit addition unit to the telephone. |
| 申请公布号 |
JPS52120705(A) |
申请公布日期 |
1977.10.11 |
| 申请号 |
JP19760037306 |
申请日期 |
1976.04.05 |
| 申请人 |
NIPPON TELEGRAPH & TELEPHONE;KANDA TSUSHIN KOGYO KK |
发明人 |
SEKIGUCHI AKINOBU;TAKAGAWA YUUICHIROU;SASAI MINORU;NOJIMA SHIYOUJI |
| 分类号 |
H04M1/70;H04M1/72 |
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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