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发明名称
Traffic sign
摘要
申请公布号
US1833124(A)
申请公布日期
1931.11.24
申请号
US19290345509
申请日期
1929.03.08
申请人
MARCHANT RAND WILLIAM
发明人
RAND WILLIAM MARCHANT
分类号
E01F9/04
主分类号
E01F9/04
代理机构
代理人
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