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经营范围
发明名称
EXTENSION MUTUAL TRUNK
摘要
PURPOSE:To easily inform the call termination of another party with line busy sound receipt, by line busy tone transmission in an extension mutual trunk, to prevent erroneous cut and to decrease null reservation of a trunk.
申请公布号
JPS5279809(A)
申请公布日期
1977.07.05
申请号
JP19750158305
申请日期
1975.12.26
申请人
NIPPON ELECTRIC CO
发明人
KUROSAWA KAZUO
分类号
H04Q3/42;H04Q3/00
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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