| 发明名称 |
REQUESTING TONE CONTROL UNIT IN PUBLIC TELEPHON |
| 摘要 |
PURPOSE:To prevent lowering of a speech quality by not making a requesting tone to generate until a last unit time of a call by a large denomination coin even if a polarity pulse arrives. |
| 申请公布号 |
JPS5277608(A) |
申请公布日期 |
1977.06.30 |
| 申请号 |
JP19750154379 |
申请日期 |
1975.12.24 |
| 申请人 |
NIPPON DENSHIN DENWA KOSHA;TAMURA DENKI SEISAKUSHIYO KK |
发明人 |
TADA HIROSHI;YOSHIDA KAZUHIKO;IWAI AKIRA;SHINOHARA OSAMU |
| 分类号 |
H04M17/02;H04M17/00;(IPC1-7):04M17/00 |
主分类号 |
H04M17/02 |
| 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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