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发明名称
Double bearing rail anticreeper
摘要
申请公布号
US2161484(A)
申请公布日期
1939.06.06
申请号
US19380213970
申请日期
1938.06.16
申请人
POOR & COMPANY
发明人
PRESTON FREDERICK A.
分类号
E01B13/02
主分类号
E01B13/02
代理机构
代理人
主权项
地址
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