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发明名称
Piano back structure
摘要
申请公布号
US3001433(A)
申请公布日期
1961.09.26
申请号
US19570667374
申请日期
1957.06.24
申请人
MERKEL LOUIS J
发明人
MERKEL LOUIS J.
分类号
G10C3/04
主分类号
G10C3/04
代理机构
代理人
主权项
地址
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