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发明名称
Piano
摘要
申请公布号
US1990764(A)
申请公布日期
1935.02.12
申请号
US19320631619
申请日期
1932.09.03
申请人
WESSELL FERNANDO A
发明人
WESSELL FERNANDO A.
分类号
G10C1/00
主分类号
G10C1/00
代理机构
代理人
主权项
地址
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