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发明名称
Installation d'intercommunication de deux ou plusieurs postes téléphoniques et de trafic de conversations en haut-parleur
摘要
申请公布号
FR57184(E)
申请公布日期
1952.12.16
申请号
FRD57184
申请日期
1947.03.28
申请人
LES DIFFUSIONS MODERNES
发明人
FREJAVILLE JEAN
分类号
H04M1/62;H04M9/00;H04M9/08
主分类号
H04M1/62
代理机构
代理人
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