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发明名称
Improvements in and relating to electric signalling systems
摘要
申请公布号
GB385535(A)
申请公布日期
1932.12.29
申请号
GB19320017796
申请日期
1932.06.23
申请人
FRED CHAMIER
发明人
分类号
H04K1/06
主分类号
H04K1/06
代理机构
代理人
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地址
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