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发明名称
Improvements in or relating to multi-channel pulse two-wire communication exchange systems
摘要
申请公布号
GB769734(A)
申请公布日期
1957.03.13
申请号
GB19550006992
申请日期
1955.03.09
申请人
TELEFONAKTIEBOLAGET L M ERICSSON
发明人
分类号
H04Q11/04
主分类号
H04Q11/04
代理机构
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