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发明名称
Apparatus for teaching music
摘要
申请公布号
US1947686(A)
申请公布日期
1934.02.20
申请号
US19330663189
申请日期
1933.03.28
申请人
WALSH HAZEL B
发明人
WALSH HAZEL B.
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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