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经营范围
发明名称
FEEDBACK REDUCING TELEPHONE HANDSET
摘要
申请公布号
GB2256342(A)
申请公布日期
1992.12.02
申请号
GB19920009843
申请日期
1992.05.07
申请人
* BRITISH TELECOMMUNICATIONS PLC
发明人
ROBIN CHRISTOPHER * CROSS
分类号
H04M1/20
主分类号
H04M1/20
代理机构
代理人
主权项
地址
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