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发明名称
Electrically operated key-changing harp mechanism
摘要
申请公布号
US2812681(A)
申请公布日期
1957.11.12
申请号
US19530391918
申请日期
1953.11.13
申请人
CARRON ARTHUR L
发明人
CARRON ARTHUR L.
分类号
G10D1/04
主分类号
G10D1/04
代理机构
代理人
主权项
地址
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