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发明名称
Device for facilitating the playing by hand of keyed musical instruments
摘要
申请公布号
GB339992(A)
申请公布日期
1930.12.18
申请号
GB19290028293
申请日期
1929.09.18
申请人
ANTON CARL REFSGAARD
发明人
分类号
G10G1/02
主分类号
G10G1/02
代理机构
代理人
主权项
地址
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