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发明名称
Educational device
摘要
申请公布号
US1856650(A)
申请公布日期
1932.05.03
申请号
US19290376147
申请日期
1929.07.05
申请人
MCLINTOCK ADDISON W;RICE JOHN W
发明人
MCLINTOCK ADDISON W.;RICE JOHN W.
分类号
G09B1/06
主分类号
G09B1/06
代理机构
代理人
主权项
地址
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