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发明名称
Simplified musical keyboard
摘要
申请公布号
GB9906935(D0)
申请公布日期
1999.05.19
申请号
GB19990006935
申请日期
1999.03.26
申请人
HIRSH, LAWRENCE P
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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