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发明名称
INSTRUMENT FOR PRACTISING MULTIPLICATION
摘要
申请公布号
GB2197521(B)
申请公布日期
1990.07.25
申请号
GB19870025266
申请日期
1987.10.28
申请人
* KAWAI GAKKI SEISAKUSHO CO LTD
发明人
FUMITAKA * TAKAHASHI
分类号
G09B19/02;G09B23/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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