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发明名称
Railroad tie
摘要
申请公布号
US1769089(A)
申请公布日期
1930.07.01
申请号
US19300429505
申请日期
1930.02.19
申请人
YOKLEY ORANGE E
发明人
YOKLEY ORANGE E.
分类号
E01B3/16
主分类号
E01B3/16
代理机构
代理人
主权项
地址
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