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发明名称
TELEPHONE CONFERENCE AMPLIFIER
摘要
申请公布号
GB1601472(A)
申请公布日期
1981.10.28
申请号
GB19770010185
申请日期
1978.03.10
申请人
POST OFFICE
发明人
分类号
H04M3/56;(IPC1-7):H04M3/56
主分类号
H04M3/56
代理机构
代理人
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地址
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