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发明名称
Road signal
摘要
申请公布号
US2186258(A)
申请公布日期
1940.01.09
申请号
US19370164647
申请日期
1937.09.20
申请人
MCDONALD ELMER W
发明人
MCDONALD ELMER W.
分类号
G08B5/00
主分类号
G08B5/00
代理机构
代理人
主权项
地址
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