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发明名称
Railway signaling system
摘要
申请公布号
US2225473(A)
申请公布日期
1940.12.17
申请号
US19380223838
申请日期
1938.08.09
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
GRIFFITHS JOHN BALMAIN
分类号
B61L19/06
主分类号
B61L19/06
代理机构
代理人
主权项
地址
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