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发明名称
Teaching device
摘要
申请公布号
US3383114(A)
申请公布日期
1968.05.14
申请号
US19650452107
申请日期
1965.04.30
申请人
MATTEL, INC.
发明人
RYAN JOHN W.
分类号
G09B5/06;G11B33/06
主分类号
G09B5/06
代理机构
代理人
主权项
地址
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