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经营范围
发明名称
MATHEMATICS TEACHING DEVICE
摘要
申请公布号
US3432943(A)
申请公布日期
1969.03.18
申请号
USD3432943
申请日期
1967.03.02
申请人
EDUCATIONAL RESEARCH COUNCIL OF GREAT CLEVELAND
发明人
STEPHEN L. MERKEL
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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