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经营范围
发明名称
Railway signaling apparatus
摘要
申请公布号
US2022074(A)
申请公布日期
1935.11.26
申请号
US19340730771
申请日期
1934.06.15
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
BUTRIDGE JAMES H.
分类号
B61L1/18
主分类号
B61L1/18
代理机构
代理人
主权项
地址
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