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发明名称
Reading-training devices
摘要
申请公布号
US2919500(A)
申请公布日期
1960.01.05
申请号
US19560605403
申请日期
1956.08.21
申请人
ELIZABETH A. SIMPSON
发明人
SIMPSON JOHN A.;SINILA ALEXANDER;JR. CHARLES E. SODERQUIST,
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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