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发明名称
Perfectionnements aux dispositifs reproducteurs de sons
摘要
申请公布号
FR680259(A)
申请公布日期
1930.04.28
申请号
FRD680259
申请日期
1929.08.13
申请人
发明人
COTTON ARTHUR FREDERICK RICHMOND
分类号
H04R7/12
主分类号
H04R7/12
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代理人
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