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发明名称
Educational devices
摘要
申请公布号
US2797500(A)
申请公布日期
1957.07.02
申请号
US19550515681
申请日期
1955.06.15
申请人
FISK CARL E
发明人
FISK CARL E.
分类号
G09B27/02
主分类号
G09B27/02
代理机构
代理人
主权项
地址
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