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发明名称
Piano construction
摘要
申请公布号
US1924720(A)
申请公布日期
1933.08.29
申请号
US19320600311
申请日期
1932.03.21
申请人
KRINGEL FRANK W
发明人
KRINGEL FRANK W.
分类号
G10C3/10
主分类号
G10C3/10
代理机构
代理人
主权项
地址
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