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经营范围
发明名称
Improvements in or relating to electric signalling systems
摘要
申请公布号
GB480444(A)
申请公布日期
1938.02.23
申请号
GB19360023225
申请日期
1936.08.24
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;DOUGLAS AUBREY LEY
发明人
分类号
H03C1/58
主分类号
H03C1/58
代理机构
代理人
主权项
地址
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