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发明名称
Procédés et dispositifs d'enregistrement et de lecture mécanique d'oscillations sonores
摘要
申请公布号
FR819694(A)
申请公布日期
1937.10.23
申请号
FRD819694
申请日期
1937.03.24
申请人
RETERSON HOLDING S. A.
发明人
分类号
G11B15/70
主分类号
G11B15/70
代理机构
代理人
主权项
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