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发明名称
Railway track structure
摘要
申请公布号
US2224731(A)
申请公布日期
1940.12.10
申请号
US19390285232
申请日期
1939.07.19
申请人
BETHLEHEM STEEL COMPANY
发明人
JOHNSON OLIVER W.
分类号
E01B9/34
主分类号
E01B9/34
代理机构
代理人
主权项
地址
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