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发明名称
Piano construction
摘要
申请公布号
US2387491(A)
申请公布日期
1945.10.23
申请号
US19430505761
申请日期
1943.10.11
申请人
BETHUNE JOHN W
发明人
BETHUNE JOHN W.
分类号
G10C3/06
主分类号
G10C3/06
代理机构
代理人
主权项
地址
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