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发明名称
Railroad tie
摘要
申请公布号
US1747054(A)
申请公布日期
1930.02.11
申请号
US19290364841
申请日期
1929.05.21
申请人
COX GEORGE B
发明人
COX GEORGE B.
分类号
E01B3/18
主分类号
E01B3/18
代理机构
代理人
主权项
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