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发明名称
A new or improved changing sign or the like
摘要
申请公布号
GB330037(A)
申请公布日期
1930.06.05
申请号
GB19290009345
申请日期
1929.03.22
申请人
GEORGE WISEMAN;ERNEST WISEMAN
发明人
分类号
G09F11/02
主分类号
G09F11/02
代理机构
代理人
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