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发明名称
Reflector sign
摘要
申请公布号
US1807374(A)
申请公布日期
1931.05.26
申请号
US19290363516
申请日期
1929.05.16
申请人
BOWERMAN FRED W
发明人
BOWERMAN FRED W.
分类号
G09F13/14
主分类号
G09F13/14
代理机构
代理人
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