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发明名称
Schaltungsanordnung für die Herstellung von Fernsprechverbindungen mittels Vierdrahtleitungen.
摘要
申请公布号
CH190853(A)
申请公布日期
1937.05.15
申请号
CHD190853
申请日期
1935.06.28
申请人
DE VRIES,WILLEM CECIL
发明人
CECIL DE VRIES,WILLEM
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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