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经营范围
发明名称
Improvements in methods of recording sound in association with picture films and apparatus therefor
摘要
申请公布号
GB329785(A)
申请公布日期
1930.05.29
申请号
GB19290012074
申请日期
1929.04.18
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
G11B7/00
主分类号
G11B7/00
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代理人
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