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发明名称
Sound study apparatus for multiple structure contents using electric pen
摘要
申请公布号
KR100605397(B1)
申请公布日期
2006.07.28
申请号
KR20040072651
申请日期
2004.09.10
申请人
发明人
分类号
G09B5/06
主分类号
G09B5/06
代理机构
代理人
主权项
地址
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