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发明名称
Time teacher
摘要
申请公布号
US2749627(A)
申请公布日期
1956.06.12
申请号
US19550480344
申请日期
1955.01.07
申请人
JONES DONALD B
发明人
JONES DONALD B.
分类号
G09B19/12
主分类号
G09B19/12
代理机构
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