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发明名称
Electric mathematical educational appliance
摘要
申请公布号
US2389394(A)
申请公布日期
1945.11.20
申请号
US19440523141
申请日期
1944.02.19
申请人
JOSEPH L. LENZ
发明人
THOMAS ALLAN H.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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