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发明名称
Improvements in harmonic devices for stringed instruments
摘要
申请公布号
GB338658(A)
申请公布日期
1930.11.27
申请号
GB19290029197
申请日期
1929.09.26
申请人
MILLS NOVELTY CO.
发明人
分类号
G10F1/18
主分类号
G10F1/18
代理机构
代理人
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