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发明名称
Music teaching device
摘要
申请公布号
US2406946(A)
申请公布日期
1946.09.03
申请号
US19440519997
申请日期
1944.01.28
申请人
FIRESTONE FLOYD A
发明人
FIRESTONE FLOYD A.
分类号
G10G1/00
主分类号
G10G1/00
代理机构
代理人
主权项
地址
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