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发明名称
Loud speaker
摘要
申请公布号
US1838743(A)
申请公布日期
1931.12.29
申请号
US19280269654
申请日期
1928.04.13
申请人
SOCIETE FRANCAISE RADIO ELECTRIQUE
发明人
CHIREIX HENRI
分类号
H04R7/18
主分类号
H04R7/18
代理机构
代理人
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