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发明名称
Loud speaker
摘要
申请公布号
US1908513(A)
申请公布日期
1933.05.09
申请号
US19310525943
申请日期
1931.03.28
申请人
RADIO CORPORATION OF AMERICA
发明人
HOLST GILLES
分类号
H04R1/02
主分类号
H04R1/02
代理机构
代理人
主权项
地址
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