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发明名称
Improvements in telephone plants
摘要
申请公布号
GB379370(A)
申请公布日期
1932.08.29
申请号
GB19310015810
申请日期
1931.05.29
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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