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发明名称
RAILWAY TIE SPACER
摘要
申请公布号
CA322210(A)
申请公布日期
1932.05.10
申请号
CAD322210
申请日期
申请人
JOHN N. OSTROM
发明人
JOHN N. OSTROM
分类号
主分类号
代理机构
代理人
主权项
地址
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