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发明名称
Reflector button sign
摘要
申请公布号
US1918727(A)
申请公布日期
1933.07.18
申请号
US19320625259
申请日期
1932.07.28
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
WELLS WESLEY B.
分类号
G09F13/16
主分类号
G09F13/16
代理机构
代理人
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