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发明名称
Piano
摘要
申请公布号
US2073463(A)
申请公布日期
1937.03.09
申请号
US19350056678
申请日期
1935.12.30
申请人
THAYER-ACTION COMPANY
发明人
DASENBROOK CHARLES H.
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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