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发明名称
HEARING ASSIST TELEPHONE
摘要
申请公布号
GB9011967(D0)
申请公布日期
1990.07.18
申请号
GB19900011967
申请日期
1990.05.29
申请人
PLANTRONICS INC
发明人
分类号
H04M1/247;H04M1/60;H04M19/04
主分类号
H04M1/247
代理机构
代理人
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地址
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