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发明名称
Traffic signal
摘要
申请公布号
US1758481(A)
申请公布日期
1930.05.13
申请号
US19280328194
申请日期
1928.12.24
申请人
JO MARGARET TORRENCE
发明人
TORRENCE LEO 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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