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发明名称
HEARING AID
摘要
申请公布号
GB1541004(A)
申请公布日期
1979.02.21
申请号
GB19750046190
申请日期
1975.11.07
申请人
NAT RES DEV CORP
发明人
分类号
H04R25/00;(IPC1-7):H04R25/00
主分类号
H04R25/00
代理机构
代理人
主权项
地址
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