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经营范围
发明名称
Railroad-track structure
摘要
申请公布号
US1752152(A)
申请公布日期
1930.03.25
申请号
US19290354390
申请日期
1929.04.11
申请人
WILLIAM DALTON
发明人
DALTON WILLIAM
分类号
E01B9/46
主分类号
E01B9/46
代理机构
代理人
主权项
地址
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