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发明名称
Railway traffic controlling apparatus
摘要
申请公布号
US1830775(A)
申请公布日期
1931.11.10
申请号
US19280317275
申请日期
1928.11.05
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
WALLACE HERBERT A.
分类号
B61L7/08
主分类号
B61L7/08
代理机构
代理人
主权项
地址
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