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发明名称
Concrete railway tie
摘要
申请公布号
US2551500(A)
申请公布日期
1951.05.01
申请号
US19450580887
申请日期
1945.03.03
申请人
MANEY MABELLE D
发明人
MANEY MABELLE D.
分类号
E01B3/42
主分类号
E01B3/42
代理机构
代理人
主权项
地址
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