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发明名称
Traffic signal
摘要
申请公布号
US1756144(A)
申请公布日期
1930.04.29
申请号
US19240712575
申请日期
1924.05.12
申请人
AMES ARTHUR R
发明人
AMES ARTHUR R.
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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