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发明名称
Traffic sign
摘要
申请公布号
US3394674(A)
申请公布日期
1968.07.30
申请号
US19660577008
申请日期
1966.09.02
申请人
DONALD M. DOWNING
发明人
DOWNING DONALD M.
分类号
G08G1/09
主分类号
G08G1/09
代理机构
代理人
主权项
地址
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