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发明名称
Group teaching machine
摘要
申请公布号
GB1114471(A)
申请公布日期
1968.05.22
申请号
GB19640014427
申请日期
1964.04.08
申请人
KENNETH HOLLING
发明人
分类号
G09B7/073
主分类号
G09B7/073
代理机构
代理人
主权项
地址
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