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经营范围
发明名称
Improvements in and relating to electrical sound reproducing instruments
摘要
申请公布号
GB336648(A)
申请公布日期
1930.10.15
申请号
GB19290021687
申请日期
1929.07.15
申请人
HERBERT EDWARD HOLMAN
发明人
分类号
H04R11/08
主分类号
H04R11/08
代理机构
代理人
主权项
地址
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