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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR49158(E)
申请公布日期
1938.11.28
申请号
FRD49158
申请日期
1937.07.05
申请人
COMPAGNIE DES TELEPHONES THOMSON-HOUSTON
发明人
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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地址
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