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发明名称
Variable band width piezoelectric filter
摘要
申请公布号
US2173894(A)
申请公布日期
1939.09.26
申请号
US19380188034
申请日期
1938.02.01
申请人
RADIO CORPORATION OF AMERICA
发明人
ATWOOD JOHN BOYD
分类号
H03H9/54
主分类号
H03H9/54
代理机构
代理人
主权项
地址
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