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发明名称
Dispositif pour un système de transmission approprié à l'amplification et à la réception tant de signaux d'appel que de signaux d'alarme
摘要
申请公布号
FR1131522(A)
申请公布日期
1957.02.22
申请号
FRD1131522
申请日期
1955.05.11
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H04Q1/44
主分类号
H04Q1/44
代理机构
代理人
主权项
地址
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