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发明名称
Perfectionnements aux mégaphones électriques
摘要
申请公布号
FR689442(A)
申请公布日期
1930.09.05
申请号
FRD689442
申请日期
1930.02.05
申请人
发明人
BROWN SIDNEY GEORGE
分类号
H04R1/08
主分类号
H04R1/08
代理机构
代理人
主权项
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