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发明名称
Loud-speakers
摘要
申请公布号
GB342369(A)
申请公布日期
1931.02.05
申请号
GB19290033625
申请日期
1929.11.05
申请人
FREDERICK HORACE-HULME
发明人
分类号
H04R1/28
主分类号
H04R1/28
代理机构
代理人
主权项
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