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发明名称
Reading-training device
摘要
申请公布号
US2662306(A)
申请公布日期
1953.12.15
申请号
US19500182743
申请日期
1950.09.01
申请人
ELIZABETH A. SIMPSON
发明人
MCMASTER ARCHIE J.
分类号
G09B17/04
主分类号
G09B17/04
代理机构
代理人
主权项
地址
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