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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR854039(A)
申请公布日期
1940.04.03
申请号
FRD854039
申请日期
1938.12.05
申请人
COMPAGNIE DES TELEPHONES THOMSON-HOUSTON
发明人
分类号
H04M3/60;H04Q3/42
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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