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发明名称
Amplifying stringed instrument
摘要
申请公布号
US2139099(A)
申请公布日期
1938.12.06
申请号
US19370146214
申请日期
1937.06.03
申请人
ROBERTSON RALPH W
发明人
ROBERTSON RALPH W.
分类号
G10D3/02
主分类号
G10D3/02
代理机构
代理人
主权项
地址
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