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发明名称
Prefectionnements à la signalisation électrique
摘要
申请公布号
FR1005166(A)
申请公布日期
1952.04.07
申请号
FRD1005166
申请日期
1947.06.13
申请人
发明人
SOURGENS ROGER-PIERRE-EUGENE
分类号
H04L17/14
主分类号
H04L17/14
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代理人
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