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发明名称
Improvements in sound amplifiers or loud speakers
摘要
申请公布号
GB326614(A)
申请公布日期
1930.03.20
申请号
GB19290002522
申请日期
1929.01.24
申请人
MARK WARD
发明人
分类号
H04R9/06
主分类号
H04R9/06
代理机构
代理人
主权项
地址
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