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发明名称
Прибор для испытания слуха
摘要
申请公布号
SU21650(A1)
申请公布日期
1931.07.31
申请号
SU19290054855
申请日期
1929.09.18
申请人
IVANOV B.N.
发明人
IVANOV B.N.
分类号
G09B15/00
主分类号
G09B15/00
代理机构
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