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发明名称
Release signal system for telegraph exchange systems
摘要
申请公布号
GB680103(A)
申请公布日期
1952.10.01
申请号
GB19470034843
申请日期
1947.12.30
申请人
STAATSBEDRIJF DER POSTERIJEN TELEGRAFIE EN TELEFONIE
发明人
OBERMAN ROELOF MAARTEN MARIE
分类号
H04L12/02
主分类号
H04L12/02
代理机构
代理人
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