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经营范围
发明名称
Improvements in and relating to sound films
摘要
申请公布号
GB362888(A)
申请公布日期
1931.12.08
申请号
GB19300017443
申请日期
1930.06.05
申请人
HANS FRIESS
发明人
分类号
G03B31/00
主分类号
G03B31/00
代理机构
代理人
主权项
地址
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