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发明名称
Sound reproducing device
摘要
申请公布号
US2439665(A)
申请公布日期
1948.04.13
申请号
US19440520496
申请日期
1944.01.31
申请人
RADIO CORPORATION
发明人
MARQUIS JOHN F.
分类号
H04R7/20
主分类号
H04R7/20
代理机构
代理人
主权项
地址
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