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发明名称
Perfectionnements aux procédés et appareils destinés à l'enregistrement du son, ainsi qu'aux phonogrammes
摘要
申请公布号
FR724677(A)
申请公布日期
1932.04.30
申请号
FRD724677
申请日期
1931.09.04
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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