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发明名称
Roller bearing unit for freight cars
摘要
申请公布号
US2115989(A)
申请公布日期
1938.05.03
申请号
US19350012783
申请日期
1935.03.25
申请人
AMERICAN STEEL FOUNDRIES
发明人
HEDGCOCK WILLIAM C.
分类号
B60B37/06
主分类号
B60B37/06
代理机构
代理人
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