| 发明名称 |
INFORMATION TRANSMITTING SYSTEM |
| 摘要 |
PURPOSE:To secure an economical information transmission of the trunk call from the originating register by inverting the polarity between A and B lines against the line unit in the public telephone circuit. |
| 申请公布号 |
JPS547211(A) |
申请公布日期 |
1979.01.19 |
| 申请号 |
JP19770072067 |
申请日期 |
1977.06.20 |
| 申请人 |
HITACHI LTD |
发明人 |
FURUYA TSUNEO |
| 分类号 |
H04Q1/30;H04Q1/38;H04Q3/42 |
主分类号 |
H04Q1/30 |
| 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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