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发明名称
Improvements in systems for the optical recording of sounds on cinematograph films
摘要
申请公布号
GB420265(A)
申请公布日期
1934.11.28
申请号
GB19340006223
申请日期
1934.02.26
申请人
BRUNO FRANCISCI
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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