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发明名称
Educational device
摘要
申请公布号
US1995154(A)
申请公布日期
1935.03.19
申请号
US19330684613
申请日期
1933.08.11
申请人
J. LANDOWNE COMPANY, INC.
发明人
MORRISON EDITH E.
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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