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发明名称
Educational device
摘要
申请公布号
US3246402(A)
申请公布日期
1966.04.19
申请号
US19630294440
申请日期
1963.07.11
申请人
LEONARD DIAMOND AARON
发明人
DIAMOND AARON LEONARD
分类号
G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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