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发明名称
Educational device
摘要
申请公布号
US1838942(A)
申请公布日期
1931.12.29
申请号
US19310532076
申请日期
1931.04.22
申请人
HEID CHARLES M
发明人
HEID CHARLES M.
分类号
G09B27/02
主分类号
G09B27/02
代理机构
代理人
主权项
地址
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