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经营范围
发明名称
Teaching aid
摘要
申请公布号
US3206872(A)
申请公布日期
1965.09.21
申请号
US19630254225
申请日期
1963.01.28
申请人
NASON LESLIE J;DIANE BAILEY P
发明人
NASON LESLIE J.;BAILEY P. DIANE
分类号
G09B3/04
主分类号
G09B3/04
代理机构
代理人
主权项
地址
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