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发明名称
Teaching device
摘要
申请公布号
US3021612(A)
申请公布日期
1962.02.20
申请号
US19610083568
申请日期
1961.01.18
申请人
PALMER ALEX D
发明人
PALMER ALEX D.
分类号
G09B3/04
主分类号
G09B3/04
代理机构
代理人
主权项
地址
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