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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
GB418442(A)
申请公布日期
1934.10.22
申请号
GB19330011571
申请日期
1933.04.20
申请人
LEONARD ERNEST RYALL
发明人
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
主权项
地址
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