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发明名称
Perfectionnements aux dispositifs pour l'enregistrement et la reproduction des sons
摘要
申请公布号
FR858641(A)
申请公布日期
1940.11.29
申请号
FRD858641
申请日期
1939.08.03
申请人
FILM RECORDING CORPORATION
发明人
分类号
G11B25/06
主分类号
G11B25/06
代理机构
代理人
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