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发明名称
Аппарат для выключения слуха при лечении недостатков речи
摘要
申请公布号
SU90875(A1)
申请公布日期
1949.11.30
申请号
SU19490400763
申请日期
1949.06.17
申请人
DERAZHNE I.YA.
发明人
DERAZHNE I.YA.
分类号
A61F5/58
主分类号
A61F5/58
代理机构
代理人
主权项
地址
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