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发明名称
Dispositif pour la présentation de films sonores
摘要
申请公布号
FR712794(A)
申请公布日期
1931.10.10
申请号
FRD712794
申请日期
1930.12.08
申请人
SOCIETE JOHANNES NITZSCHE
发明人
分类号
G03B31/02
主分类号
G03B31/02
代理机构
代理人
主权项
地址
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