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发明名称
Improvements relating to telephones
摘要
申请公布号
GB2019161(A)
申请公布日期
1979.10.24
申请号
GB19790004953
申请日期
1979.02.12
申请人
POST OFFICE
发明人
分类号
H04M3/14;(IPC1-7):H04M3/14
主分类号
H04M3/14
代理机构
代理人
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