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发明名称
Polyphase hammers for musical instruments
摘要
申请公布号
US1769952(A)
申请公布日期
1930.07.08
申请号
US19270199589
申请日期
1927.06.17
申请人
HILL ROGER M
发明人
HILL ROGER M.
分类号
G10H1/02
主分类号
G10H1/02
代理机构
代理人
主权项
地址
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