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发明名称
Educational device
摘要
申请公布号
US2338850(A)
申请公布日期
1944.01.11
申请号
US19420461516
申请日期
1942.10.10
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
HEYDEN ROBERT A.
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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