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经营范围
发明名称
Educational apparatus
摘要
申请公布号
US3401470(A)
申请公布日期
1968.09.17
申请号
US19660547489
申请日期
1966.05.04
申请人
MCGRAW-EDISON COMPANY
发明人
GAVEN THOMAS J.
分类号
G09B5/06
主分类号
G09B5/06
代理机构
代理人
主权项
地址
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