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发明名称
Musical instruction
摘要
申请公布号
US2123258(A)
申请公布日期
1938.07.12
申请号
US19320643623
申请日期
1932.11.21
申请人
HOWLAND RANGER RICHARD
发明人
RANGER RICHARD HOWLAND
分类号
G09B15/00
主分类号
G09B15/00
代理机构
代理人
主权项
地址
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