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发明名称
Perfectionnements aux appareils électriques de signalisation
摘要
申请公布号
FR713934(A)
申请公布日期
1931.11.13
申请号
FRD713934
申请日期
1931.03.27
申请人
BRITISH RADIOSTAT CORPORATION LIMITED
发明人
分类号
H03H9/48
主分类号
H03H9/48
代理机构
代理人
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