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发明名称
Improvements in and relating to the art of teaching and acquiring the art of writing
摘要
申请公布号
GB352173(A)
申请公布日期
1931.07.09
申请号
GB19300015595
申请日期
1930.05.21
申请人
JOHN PEARCE
发明人
分类号
G09B11/04
主分类号
G09B11/04
代理机构
代理人
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