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发明名称
Rail spike
摘要
申请公布号
US2257641(A)
申请公布日期
1941.09.30
申请号
US19400339975
申请日期
1940.06.11
申请人
MULLER GEORGE W
发明人
MULLER GEORGE W.
分类号
E01B9/08
主分类号
E01B9/08
代理机构
代理人
主权项
地址
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