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发明名称
Cadran lumineux permettant de composer les numéros téléphoniques dans l'obscurité
摘要
申请公布号
FR978276(A)
申请公布日期
1951.04.11
申请号
FRD978276
申请日期
1948.12.29
申请人
发明人
OESTERMAN EDOUARD
分类号
H04M1/22
主分类号
H04M1/22
代理机构
代理人
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