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经营范围
发明名称
Combined pedestrian traffic signal and advertising device
摘要
申请公布号
US2503574(A)
申请公布日期
1950.04.11
申请号
US19470746252
申请日期
1947.05.06
申请人
THE WALKOLITE COMPANY, INCORPORATED
发明人
ALLEN JOHN S.
分类号
E01F9/053;G09F13/26
主分类号
E01F9/053
代理机构
代理人
主权项
地址
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