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发明名称
A new or improved letter sign
摘要
申请公布号
GB395120(A)
申请公布日期
1933.07.13
申请号
GB19320011442
申请日期
1932.04.21
申请人
CHARLES ARTHUR NASMYTH ROBERTS
发明人
分类号
G09F13/26
主分类号
G09F13/26
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代理人
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