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发明名称
Railway signaling system
摘要
申请公布号
US1748788(A)
申请公布日期
1930.02.25
申请号
US19280287394
申请日期
1928.06.22
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
OBER HERMON P.
分类号
B61L1/20
主分类号
B61L1/20
代理机构
代理人
主权项
地址
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