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发明名称
Lernspiel fuer modernes Rechnen und elementare Geometrie
摘要
申请公布号
DE1772594(A1)
申请公布日期
1971.05.19
申请号
DE19681772594
申请日期
1968.06.07
申请人
RUEECK,FRIEDRICH
发明人
RUEECK,FRIEDRICH
分类号
G09B19/02;G09B23/04
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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