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发明名称
Visual volume control
摘要
申请公布号
US2064462(A)
申请公布日期
1936.12.15
申请号
US19320623534
申请日期
1932.07.20
申请人
RADIO CORPORATION OF AMERICA
发明人
CRAIG PALMER M.;WARD ALBERT K.
分类号
H04H20/83
主分类号
H04H20/83
代理机构
代理人
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