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经营范围
发明名称
Teaching aid and self-correcting response device
摘要
申请公布号
GB1119472(A)
申请公布日期
1968.07.10
申请号
GB19660042163
申请日期
1966.09.21
申请人
ALVAN FRANCIS DAVENPORT
发明人
分类号
G09B3/08
主分类号
G09B3/08
代理机构
代理人
主权项
地址
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