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发明名称
Improvements in intercommunication telephone systems
摘要
申请公布号
GB308811(A)
申请公布日期
1930.07.28
申请号
GB19290009882
申请日期
1929.03.27
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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