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发明名称
Educational material
摘要
申请公布号
US1868823(A)
申请公布日期
1932.07.26
申请号
US19300423399
申请日期
1930.01.25
申请人
GOODRICH THOMAS V
发明人
GOODRICH THOMAS V.
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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