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发明名称
Piano action
摘要
申请公布号
US2468132(A)
申请公布日期
1949.04.26
申请号
US19450587272
申请日期
1945.04.09
申请人
PRATT, READ AND COMPANY, INC.
发明人
STEIN CHARLES FREDERICK
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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