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经营范围
发明名称
Musical practice device with an optical metronome
摘要
申请公布号
CH620538(A5)
申请公布日期
1980.11.28
申请号
CH19770007703
申请日期
1977.06.23
申请人
DEL CASTILLO, JUAN M.
发明人
JUAN M. DEL CASTILLO
分类号
G09B15/00;G04F5/02;G09B15/02;(IPC1-7):G10G1/02
主分类号
G09B15/00
代理机构
代理人
主权项
地址
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