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经营范围
发明名称
Apparatus for Teaching or Studying Mathematics
摘要
申请公布号
GB2084376(A)
申请公布日期
1982.04.07
申请号
GB19800030933
申请日期
1980.09.25
申请人
CLEGG GERALD ALEXANDER
发明人
分类号
G09B19/02;(IPC1-7):G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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