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发明名称
Perfectionnement aux indicateurs horaires à signes horaires visibles dans l'obscurité
摘要
申请公布号
FR1059550(A)
申请公布日期
1954.03.25
申请号
FRD1059550
申请日期
1952.07.07
申请人
发明人
DESFOURNEAUX EUGENE
分类号
G04B19/32
主分类号
G04B19/32
代理机构
代理人
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