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经营范围
发明名称
Systèmes électriques de signalisation et d'amplification
摘要
申请公布号
FR1047180(A)
申请公布日期
1953.12.11
申请号
FRD1047180
申请日期
1951.06.14
申请人
NATIONAL RESEARCH DEVELOPMENT CORPORATION
发明人
分类号
G06F1/10;H04L25/49
主分类号
G06F1/10
代理机构
代理人
主权项
地址
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