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发明名称
Piano action
摘要
申请公布号
US2528797(A)
申请公布日期
1950.11.07
申请号
US19480039039
申请日期
1948.07.16
申请人
PRATT, READ AND COMPANY, INC.
发明人
STEIN CHARLES FREDERICK
分类号
G10C3/22
主分类号
G10C3/22
代理机构
代理人
主权项
地址
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