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发明名称
Improvements in or relating to electric soundboxes
摘要
申请公布号
GB332996(A)
申请公布日期
1930.08.07
申请号
GB19290016990
申请日期
1929.06.04
申请人
PAUL GUSTAVUS ADOLPHUS HELMUTH VOIGT
发明人
分类号
H04R19/06
主分类号
H04R19/06
代理机构
代理人
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