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发明名称
Perfectionnements aux appareils destinés à l'enregistrement du son
摘要
申请公布号
FR724954(A)
申请公布日期
1932.05.06
申请号
FRD724954
申请日期
1931.10.22
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
G11B11/03
主分类号
G11B11/03
代理机构
代理人
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