发明名称 |
RESERVED RERING TRANSFER SYSTEM OF TRUCK LINE INSTALLATION |
摘要 |
PURPOSE:To simplify the installation constitution by blocking the forward and backward supervisory circuit from the channel and connecting directly the input side terminal of the trunk line installation to the output side terminal to send the vering to forward as it is in case of the detection of backward coming vering. |
申请公布号 |
JPS52122021(A) |
申请公布日期 |
1977.10.13 |
申请号 |
JP19760038191 |
申请日期 |
1976.04.07 |
申请人 |
HITACHI LTD |
发明人 |
TAWARA YOSHINORI;CHIKIRA HIROSHI |
分类号 |
H04Q3/42;H04M3/60;H04Q3/00 |
主分类号 |
H04Q3/42 |
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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