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发明名称
Perfectionnements aux systèmes téléphoniques
摘要
申请公布号
FR67622(E)
申请公布日期
1958.03.14
申请号
FRD67622
申请日期
1955.02.24
申请人
COMPAGNIE GENERALE DE CONSTRUCTIONS TELEPHONIQUES
发明人
HEYDUCK ALFRED
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
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地址
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