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发明名称
Action for grand pianos
摘要
申请公布号
US2021449(A)
申请公布日期
1935.11.19
申请号
US19340729413
申请日期
1934.06.07
申请人
GEORGE FRANK L
发明人
GEORGE FRANK L.
分类号
G10C3/22
主分类号
G10C3/22
代理机构
代理人
主权项
地址
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