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发明名称
TRAINING DEVICE FOR KEYBOARD MUSICAL INSTRUMENTS
摘要
申请公布号
RU2087941(C1)
申请公布日期
1997.08.20
申请号
RU19930048519
申请日期
1993.10.19
申请人
VALAEV ALEKSANDR A
发明人
VALAEV ALEKSANDR A
分类号
G09B15/04
主分类号
G09B15/04
代理机构
代理人
主权项
地址
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