SET OF DIDACTIC BUILDING PIECES FOR THE CONCEPTUALIZATION OF NUMERICAL QUANTITY,申请号IL19910098130-传众专利搜索

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发明名称	SET OF DIDACTIC BUILDING PIECES FOR THE CONCEPTUALIZATION OF NUMERICAL QUANTITY
摘要
申请公布号	IL98130(D0)	申请公布日期	1992.06.21
申请号	IL19910098130	申请日期	1991.05.14
申请人	JOSEPH FELDMAN	发明人
分类号	G09B;(IPC1-7):G09B/	主分类号	G09B
代理机构		代理人
主权项
地址

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