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发明名称
Railroad crosstie and method of making the same
摘要
申请公布号
US1770251(A)
申请公布日期
1930.07.08
申请号
US19290404947
申请日期
1929.11.05
申请人
CHARLES PAFF
发明人
PAFF CHARLES
分类号
E01B3/18
主分类号
E01B3/18
代理机构
代理人
主权项
地址
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