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发明名称
Improvements in or relating to multi-channel electric signalling systems
摘要
申请公布号
GB440241(A)
申请公布日期
1935.12.23
申请号
GB19350015225
申请日期
1935.05.24
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04J1/12
主分类号
H04J1/12
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代理人
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