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经营范围
发明名称
Improvements in and relating to sound heads for reproducing sound from sound films
摘要
申请公布号
GB449547(A)
申请公布日期
1936.06.29
申请号
GB19340037179
申请日期
1934.12.28
申请人
DAVID PERCIVAL FISHER
发明人
分类号
G11B5/00
主分类号
G11B5/00
代理机构
代理人
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