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发明名称
Perfectionnements aux installations téléphoniques
摘要
申请公布号
FR719729(A)
申请公布日期
1932.02.09
申请号
FRD719729
申请日期
1931.07.07
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
分类号
H04Q5/06
主分类号
H04Q5/06
代理机构
代理人
主权项
地址
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