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经营范围
发明名称
Educational appliance
摘要
申请公布号
US1951337(A)
申请公布日期
1934.03.20
申请号
US19300497883
申请日期
1930.11.24
申请人
LAFAYETTE INSTRUMENTS, INC.
发明人
BAKST AARON
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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