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发明名称
Teaching aid
摘要
申请公布号
GB2122348(A)
申请公布日期
1984.01.11
申请号
GB19830015835
申请日期
1983.06.09
申请人
RONALD * MORRIS
发明人
RONALD * MORRIS
分类号
G09B25/06;(IPC1-7):G01C9/20;G01C9/02
主分类号
G09B25/06
代理机构
代理人
主权项
地址
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