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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR751833(A)
申请公布日期
1933.09.11
申请号
FRD751833
申请日期
1932.06.03
申请人
COMPAGNIE DES TELEPHONES THOMSON-HOUSTON
发明人
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
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