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发明名称
Traffic signal
摘要
申请公布号
US2244946(A)
申请公布日期
1941.06.10
申请号
US19380231127
申请日期
1938.09.22
申请人
HAMMER JOHN J
发明人
HAMMER JOHN J.
分类号
G08G1/096
主分类号
G08G1/096
代理机构
代理人
主权项
地址
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