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发明名称
Perfectionnements aux appareils de projection cinématographique parlants
摘要
申请公布号
FR681643(A)
申请公布日期
1930.05.16
申请号
FRD681643
申请日期
1929.09.11
申请人
BRITISH TALKING PICTURES LIMITED
发明人
分类号
G03B31/02
主分类号
G03B31/02
代理机构
代理人
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地址
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