专利名称：TEACHING AID
发明人：WALKER, Roger,HISKETT, Graham申请号：EP01909993.6申请日：20010307公开号：EP1261960B1公开日：20060104
摘要：A teaching aid comprises a frame (1), a plurality of elongate rods (2) mountedhorizontally in the frame and spaced vertically from each other and a plurality ofpolyhedral blocks (3) rotatably mounted on each rod. Means are provided to releasablyhold each block (3) in at least three discrete rotary positions on its respective rod (2).
申请人：DIRECT EDUCATIONAL SERVICES LT
地址：GB
国籍：GB
代理机构：Parry, Christopher Stephen
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