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经营范围
发明名称
Appareil auxiliaire d'écoute
摘要
申请公布号
FR1178594(A)
申请公布日期
1959.05.12
申请号
FRD1178594
申请日期
1957.06.28
申请人
发明人
AAE ERHARD
分类号
A61F11/04;H04M1/215;H04R25/04
主分类号
A61F11/04
代理机构
代理人
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地址
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