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发明名称
Educational device
摘要
申请公布号
US2461926(A)
申请公布日期
1949.02.15
申请号
US19460648365
申请日期
1946.02.18
申请人
RUSSELL WINFIELD P
发明人
RUSSELL WINFIELD P.
分类号
G09B1/20
主分类号
G09B1/20
代理机构
代理人
主权项
地址
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