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发明名称
CORRECT ANSWER DISPLAYING DEVICE FOR ARITHMETIC CALCULATIONS
摘要
申请公布号
GB2171237(B)
申请公布日期
1989.06.14
申请号
GB19850024305
申请日期
1985.10.02
申请人
KABUSHIKI KAISHA * GAKUSHU KENKYUSHA
发明人
MITATE * INADA
分类号
G09B3/02;G09B19/02
主分类号
G09B3/02
代理机构
代理人
主权项
地址
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