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发明名称
Improvements in retardation devices for electric signal transmission systems
摘要
申请公布号
GB351354(A)
申请公布日期
1931.06.25
申请号
GB19300029182
申请日期
1930.09.29
申请人
GEORGES VIARD
发明人
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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