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发明名称
ELECTRONIC SYSTEM FOR MULTIPLE TELECOMMUNICATION CONFERENCE CONNECTIONS
摘要
申请公布号
PL112460(B3)
申请公布日期
1980.10.31
申请号
PL19770195222
申请日期
1977.01.07
申请人
发明人
分类号
H04M;H04M3/56;(IPC1-7):H04M3/56
主分类号
H04M
代理机构
代理人
主权项
地址
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