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发明名称
Appareil permettant d'améliorer l'audition
摘要
申请公布号
FR803291(A)
申请公布日期
1936.09.26
申请号
FRD803291
申请日期
1936.03.11
申请人
发明人
GIESLER HENRI
分类号
H04R25/02
主分类号
H04R25/02
代理机构
代理人
主权项
地址
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