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发明名称
Traffic protection apparatus
摘要
申请公布号
US2567897(A)
申请公布日期
1951.09.11
申请号
US19470791122
申请日期
1947.12.11
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
SORENSEN ANDREW J.
分类号
B61L13/04
主分类号
B61L13/04
代理机构
代理人
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地址
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