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发明名称
Changeable sign
摘要
申请公布号
US2731745(A)
申请公布日期
1956.01.24
申请号
US19520299444
申请日期
1952.07.17
申请人
O'NEILL RALPH A
发明人
O'NEILL RALPH A.
分类号
G09F11/02
主分类号
G09F11/02
代理机构
代理人
主权项
地址
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