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发明名称
TEACHING APPARATUS
摘要
申请公布号
GB8927057(D0)
申请公布日期
1990.01.31
申请号
GB19890027057
申请日期
1989.11.30
申请人
BARCLAY, ALEX D;BAILEY, RICHARD C
发明人
分类号
G09B23/18
主分类号
G09B23/18
代理机构
代理人
主权项
地址
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