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经营范围
发明名称
Plaque ou membrane vibrante particulièrement destinée aux appareils émetteurs, récepteurs ou enregistreurs de sons
摘要
申请公布号
FR686965(A)
申请公布日期
1930.08.01
申请号
FRD686965
申请日期
1929.12.19
申请人
发明人
PERSSON ERNST OSCAR
分类号
H04R7/12
主分类号
H04R7/12
代理机构
代理人
主权项
地址
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