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发明名称
AUDIO TELECONFERENCING
摘要
申请公布号
GB2009565(B)
申请公布日期
1982.02.24
申请号
GB19780047221
申请日期
1978.12.05
申请人
POST OFFICE
发明人
分类号
H04M3/56;(IPC1-7):H04M1/00;H04M3/42
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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