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发明名称
Educational device
摘要
申请公布号
US2287943(A)
申请公布日期
1942.06.30
申请号
US19400316963
申请日期
1940.02.02
申请人
O'SULLIVAN MAURICE J
发明人
O'SULLIVAN MAURICE J.
分类号
主分类号
代理机构
代理人
主权项
地址
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