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发明名称
IMPACT RESISTING RAILROAD RAIL
摘要
申请公布号
CA315452(A)
申请公布日期
1931.09.22
申请号
CAD315452
申请日期
申请人
THE DOMINION OXYGEN COMPANY
发明人
SAMUEL W. MILLER
分类号
主分类号
代理机构
代理人
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