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发明名称
Perfectionnements aux systèmes de téléphonie
摘要
申请公布号
FR725229(A)
申请公布日期
1932.05.10
申请号
FRD725229
申请日期
1931.10.14
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
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地址
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