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发明名称
Improvements in railway signals
摘要
申请公布号
GB325472(A)
申请公布日期
1930.02.18
申请号
GB19280030075
申请日期
1928.10.18
申请人
ERNEST WILLIAMS
发明人
分类号
B61L3/04
主分类号
B61L3/04
代理机构
代理人
主权项
地址
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