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发明名称
Carte postale ou autres à couche d'enregistrement sonore invisible
摘要
申请公布号
FR701518(A)
申请公布日期
1931.03.17
申请号
FRD701518
申请日期
1929.11.28
申请人
ETABLISSEMENTS LEVY ET NEURDEIN
发明人
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
主权项
地址
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