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发明名称
Device for transforming direct current telegraphic signals into alternating current signals
摘要
申请公布号
GB613431(A)
申请公布日期
1948.11.29
申请号
GB19450029587
申请日期
1945.11.06
申请人
SOCIETE ANONYME DE TELECOMMUNICATIONS
发明人
分类号
H04L25/04;H04L25/20
主分类号
H04L25/04
代理机构
代理人
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