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发明名称
Piano action
摘要
申请公布号
US2156961(A)
申请公布日期
1939.05.02
申请号
US19360093040
申请日期
1936.07.28
申请人
BETZ WILLIAM G
发明人
BETZ WILLIAM G.
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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