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发明名称
TEACHING AUXILIARY APPARATUS FOR CONTROLLING THE RESULT OF MATHEMATICAL, PREERABLY ALGEBRAIC OPERATIONS
摘要
申请公布号
HUT54821(A)
申请公布日期
1991.03.28
申请号
HU19890000826
申请日期
1989.02.21
申请人
FRUEHAUF,LASZLO,HU
发明人
FRUEHAUF,LASZLO,HU
分类号
G09B19/02;(IPC1-7):G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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