发明名称 SIMULTANEOUS CALL AND ITS UNIT
摘要 PURPOSE:The signals of subscribers who desire simultaneous call are added, and the the self-signal is eliminated from this sum for simultaneous call, so that integrating a unit becomes possible.
申请公布号 JPS5319703(A) 申请公布日期 1978.02.23
申请号 JP19760094335 申请日期 1976.08.06
申请人 NIPPON ELECTRIC CO 发明人 SHIMIZU HIROSHI
分类号 H04M9/00 主分类号 H04M9/00
代理机构 代理人
主权项
地址