| 发明名称 |
Circuit arrangement for a key-controlled intercommunication system of the type in which each substation set is provided with a facility for calling any other station |
| 摘要 |
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| 申请公布号 |
GB957456(A) |
申请公布日期 |
1964.05.06 |
| 申请号 |
GB19610035248 |
申请日期 |
1961.09.29 |
| 申请人 |
STANDARD TELEPHONES AND CABLES LIMITED |
发明人 |
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| 分类号 |
H04M9/00;H04M9/04;H04M19/04 |
主分类号 |
H04M9/00 |
| 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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