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发明名称
Perfectionnements aux installations téléphoniques à haut parleurs
摘要
申请公布号
FR60451(E)
申请公布日期
1954.11.03
申请号
FRD60451
申请日期
1950.07.18
申请人
SOCIETE COMMERCIALE DE DIFFUSION DE PROCEDES BREVETES ET DE VENTE DE PRODUITS MANUFACTURES
发明人
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
地址
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