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经营范围
发明名称
Electroacoustic apparatus
摘要
申请公布号
US2512889(A)
申请公布日期
1950.06.27
申请号
US19450583745
申请日期
1945.03.20
申请人
发明人
DREYFUS JEAN ALBERT
分类号
G10L15/00
主分类号
G10L15/00
代理机构
代理人
主权项
地址
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