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发明名称
Road sign
摘要
申请公布号
US1817064(A)
申请公布日期
1931.08.04
申请号
US19280299964
申请日期
1928.08.16
申请人
CARSON WILLIAM H
发明人
CARSON WILLIAM H.
分类号
E01F9/011
主分类号
E01F9/011
代理机构
代理人
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