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发明名称
Improvements in changing display apparatus
摘要
申请公布号
GB513123(A)
申请公布日期
1939.10.04
申请号
GB19380009160
申请日期
1938.03.25
申请人
GEORGE EDGAR SLACK
发明人
分类号
G09F11/12
主分类号
G09F11/12
代理机构
代理人
主权项
地址
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