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发明名称
Improvements in or relating to signalling systems
摘要
申请公布号
GB302571(A)
申请公布日期
1930.01.31
申请号
GB19280031647
申请日期
1928.10.31
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
分类号
H04L25/08
主分类号
H04L25/08
代理机构
代理人
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