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发明名称
Perfectionnements à l'enregistrement photographique des sons
摘要
申请公布号
FR908301(A)
申请公布日期
1946.04.05
申请号
FRD908301
申请日期
1944.12.18
申请人
发明人
PICOT MICHEL-FRANCOIS
分类号
G11B7/00
主分类号
G11B7/00
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