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发明名称
Dispositif d'amplification de courants vocaux et de signalisation à fréquence non vocale
摘要
申请公布号
FR980456(A)
申请公布日期
1951.05.15
申请号
FRD980456
申请日期
1948.12.15
申请人
发明人
JOB FRANCOIS;GUEN FRANCOIS LE
分类号
H04Q1/442
主分类号
H04Q1/442
代理机构
代理人
主权项
地址
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