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发明名称
Piano key action
摘要
申请公布号
US2634648(A)
申请公布日期
1953.04.14
申请号
US19510221106
申请日期
1951.04.14
申请人
SMITH CHARLES F
发明人
SMITH CHARLES F.
分类号
G10C3/16
主分类号
G10C3/16
代理机构
代理人
主权项
地址
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