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发明名称
Railroad washout signal controller
摘要
申请公布号
US2432451(A)
申请公布日期
1947.12.09
申请号
US19450633778
申请日期
1945.12.08
申请人
SHELDON ALLAN E
发明人
SHELDON ALLAN E.
分类号
B61L23/04
主分类号
B61L23/04
代理机构
代理人
主权项
地址
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