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发明名称
Educational test checking device
摘要
申请公布号
US2060308(A)
申请公布日期
1936.11.10
申请号
US19350016342
申请日期
1935.04.15
申请人
HARDING SAMUEL R
发明人
HARDING SAMUEL R.
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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