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经营范围
发明名称
Electromagnetic sound reproducer
摘要
申请公布号
GB313483(A)
申请公布日期
1930.02.13
申请号
GB19290001316
申请日期
1929.01.14
申请人
BRANDES LIMITED
发明人
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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