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发明名称
Railway rail and rail-joint
摘要
申请公布号
US2070246(A)
申请公布日期
1937.02.09
申请号
US19310557763
申请日期
1931.08.18
申请人
THOMSON SAMUEL G
发明人
THOMSON SAMUEL G.
分类号
E01B11/10
主分类号
E01B11/10
代理机构
代理人
主权项
地址
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