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发明名称
Apparatus for facilitating training in typing
摘要
申请公布号
GB381406(A)
申请公布日期
1932.10.06
申请号
GB19310035303
申请日期
1931.12.21
申请人
JOSEF SAFAR
发明人
分类号
B41J29/393;G09B13/00
主分类号
B41J29/393
代理机构
代理人
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