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发明名称
Light intensity control for railway signal lamps
摘要
申请公布号
US2478403(A)
申请公布日期
1949.08.09
申请号
US19470790901
申请日期
1947.12.10
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
KEMMERER RALPH R.
分类号
B61L5/18
主分类号
B61L5/18
代理机构
代理人
主权项
地址
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