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经营范围
发明名称
Sound gate
摘要
申请公布号
US2032184(A)
申请公布日期
1936.02.25
申请号
US19300462741
申请日期
1930.06.21
申请人
RADIO CORPORATION OF AMERICA
发明人
SCHIFFL FRANK
分类号
G11B7/00;G11B15/60
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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