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发明名称
Perfectionnements aux appareils de signalisation électrique
摘要
申请公布号
FR787688(A)
申请公布日期
1935.09.26
申请号
FRD787688
申请日期
1935.03.21
申请人
RADIO CORPORATION OF AMERICA
发明人
分类号
H04N5/16
主分类号
H04N5/16
代理机构
代理人
主权项
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