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发明名称
Improved keyboard for pianofortes and other instruments with similar keyboards
摘要
申请公布号
GB512829(A)
申请公布日期
1939.09.27
申请号
GB19370007643
申请日期
1938.03.16
申请人
WILLIAM GEORGE BEAVER
发明人
分类号
G10C3/28
主分类号
G10C3/28
代理机构
代理人
主权项
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