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经营范围
发明名称
Musical educational board
摘要
申请公布号
US2864275(A)
申请公布日期
1958.12.16
申请号
US19540443270
申请日期
1954.07.14
申请人
FRALEIGH ALTON L
发明人
FRALEIGH ALTON L.
分类号
G09B15/02
主分类号
G09B15/02
代理机构
代理人
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