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发明名称
Perfectionnements relatifs aux systèmes téléphoniques
摘要
申请公布号
FR707681(A)
申请公布日期
1931.07.10
申请号
FRD707681
申请日期
1930.12.08
申请人
SIEMENS BROTHERS & CO LIMITED
发明人
分类号
H04M5/08
主分类号
H04M5/08
代理机构
代理人
主权项
地址
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