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经营范围
发明名称
Automatic audio amplifier control
摘要
申请公布号
US1993860(A)
申请公布日期
1935.03.12
申请号
US19300448205
申请日期
1930.04.29
申请人
RADIO CORPORATION
发明人
ROBERTS WALTER VAN B.
分类号
H03G9/10
主分类号
H03G9/10
代理机构
代理人
主权项
地址
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