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发明名称
Electrical piano
摘要
申请公布号
US1831749(A)
申请公布日期
1931.11.10
申请号
US19280249896
申请日期
1928.01.27
申请人
O'NEILL CHARLES A
发明人
O'NEILL CHARLES A.
分类号
H05K11/00
主分类号
H05K11/00
代理机构
代理人
主权项
地址
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