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发明名称
Overhead abacus
摘要
申请公布号
GB2402524(B)
申请公布日期
2005.11.23
申请号
GB20040007417
申请日期
2004.04.01
申请人
* CLASSROOM SAFE-T PRODUCTS INC
发明人
JOAN * COTTER
分类号
G06C1/00;G09B19/02;(IPC1-7):G06C1/00
主分类号
G06C1/00
代理机构
代理人
主权项
地址
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