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发明名称
Beat frequency indicator
摘要
申请公布号
US2199189(A)
申请公布日期
1940.04.30
申请号
US19370134097
申请日期
1937.03.31
申请人
RADIO CORPORATION OF AMERICA
发明人
SCHELDORF RANALD D.
分类号
G01R23/00
主分类号
G01R23/00
代理机构
代理人
主权项
地址
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