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经营范围
发明名称
INTERPHONE EQUIPMENT
摘要
PURPOSE:To enable the call for a number of persons at a conference and others through a simple wiring and constitution, by using the common transmission line.
申请公布号
JPS53108209(A)
申请公布日期
1978.09.20
申请号
JP19770023097
申请日期
1977.03.03
申请人
SONY CORP
发明人
HIKI HARUO
分类号
H04M9/00;(IPC1-7):04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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