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发明名称
Cinder and cement railroad tie with cushioning means
摘要
申请公布号
US2631784(A)
申请公布日期
1953.03.17
申请号
US19500171433
申请日期
1950.06.30
申请人
ANDERSON CARL G
发明人
ANDERSON CARL G.
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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