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发明名称
TEACHING APPARATUS
摘要
申请公布号
GB9123884(D0)
申请公布日期
1992.01.02
申请号
GB19910023884
申请日期
1991.11.11
申请人
BALL, RONALD F
发明人
分类号
主分类号
代理机构
代理人
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