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发明名称
Educational device
摘要
申请公布号
US3229388(A)
申请公布日期
1966.01.18
申请号
US19630298929
申请日期
1963.07.31
申请人
SMITH FRANK M
发明人
SMITH FRANK M.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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