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发明名称
Traffic signal
摘要
申请公布号
US1940831(A)
申请公布日期
1933.12.26
申请号
US19310550122
申请日期
1931.07.11
申请人
WORRALL ROBERT H
发明人
WORRALL ROBERT H.
分类号
G08G1/087
主分类号
G08G1/087
代理机构
代理人
主权项
地址
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