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发明名称
Educational apparatus
摘要
申请公布号
US3139688(A)
申请公布日期
1964.07.07
申请号
US19610121291
申请日期
1961.06.09
申请人
GENERAL ATRONICS CORPORATION
发明人
ROOP ROBERT W.
分类号
G09B3/08
主分类号
G09B3/08
代理机构
代理人
主权项
地址
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