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发明名称
Player attachment for pianos
摘要
申请公布号
US2302011(A)
申请公布日期
1942.11.17
申请号
US19410418417
申请日期
1941.11.08
申请人
JOEL DRAGELIN
发明人
DRAGELIN JOEL
分类号
G10F3/00
主分类号
G10F3/00
代理机构
代理人
主权项
地址
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