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发明名称
Railroad spike
摘要
申请公布号
US3356300(A)
申请公布日期
1967.12.05
申请号
US19650467488
申请日期
1965.06.28
申请人
HARREL SAMUEL R
发明人
HARREL SAMUEL R.
分类号
E01B9/06
主分类号
E01B9/06
代理机构
代理人
主权项
地址
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