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发明名称
Loud speakers
摘要
申请公布号
GB346336(A)
申请公布日期
1931.03.27
申请号
GB19290039583
申请日期
1929.12.27
申请人
THOMAS MCCLELLAND
发明人
分类号
H04R7/12
主分类号
H04R7/12
代理机构
代理人
主权项
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