| 发明名称 |
SIMPLE HAND FREE TELEPHONE CALL EQUIPMENT |
| 摘要 |
PURPOSE:To make it possible to prevent the howling and also to make the simultaneous telephone call, by making the sound coupling to he hand set of the telephone. |
| 申请公布号 |
JPS52142908(A) |
申请公布日期 |
1977.11.29 |
| 申请号 |
JP19760059898 |
申请日期 |
1976.05.24 |
| 申请人 |
NIPPON TELEGRAPH & TELEPHONE;HASEGAWA DENKI SEISAKUSHO |
发明人 |
TAKAHARA TOSHIO;MAKINO MASAO;OOKI YOSHIZOU;SUEISHI TANJI |
| 分类号 |
H04M1/21;H04M1/215 |
主分类号 |
H04M1/21 |
| 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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