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发明名称
Piano action
摘要
申请公布号
US2637238(A)
申请公布日期
1953.05.05
申请号
US19510206445
申请日期
1951.01.17
申请人
PRATT READ & CO., INC.
发明人
MURDOCK PAUL 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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