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发明名称
Educational device
摘要
申请公布号
US2502238(A)
申请公布日期
1950.03.28
申请号
US19470769669
申请日期
1947.08.20
申请人
WADE FRANCIS A;WILLIAM METZNER
发明人
WADE FRANCIS A.;METZNER WILLIAM
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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