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发明名称
Educational device
摘要
申请公布号
US2116163(A)
申请公布日期
1938.05.03
申请号
US19340737630
申请日期
1934.07.30
申请人
EDUCATIONAL LABORATORIES, INC.
发明人
TAYLOR JAMES Y.;TAYLOR CARL C.
分类号
G09B17/02
主分类号
G09B17/02
代理机构
代理人
主权项
地址
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