发明授权
- 专利标题: Assembly including interlocking components for teaching mathematical concepts
- 专利标题(中): 套件教学数学基础连接元素
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申请号: EP95307929.0申请日: 1995-11-07
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公开(公告)号: EP0713203B1公开(公告)日: 1999-08-25
- 发明人: Woldenberg, Richard , Hoffman, Lisa
- 申请人: Learning Resources, Inc.
- 申请人地址: 675 Heathrow Drive Lincolnshire, IL 60069 US
- 专利权人: Learning Resources, Inc.
- 当前专利权人: Learning Resources, Inc.
- 当前专利权人地址: 675 Heathrow Drive Lincolnshire, IL 60069 US
- 代理机构: Skone James, Robert Edmund
- 优先权: US340599 19941116
- 主分类号: G09B19/02
- IPC分类号: G09B19/02
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