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经营范围
发明名称
Sound reproducing apparatus
摘要
申请公布号
US2157158(A)
申请公布日期
1939.05.09
申请号
US19370172886
申请日期
1937.11.05
申请人
RADIO CORPORATION OF AMERICA
发明人
BLESSING GREGORY W.;GUEDON EMILE C.
分类号
G11B3/60
主分类号
G11B3/60
代理机构
代理人
主权项
地址
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