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发明名称
Mechanische Lernhilfe
摘要
申请公布号
DE202009017562(U1)
申请公布日期
2010.04.01
申请号
DE200920017562U
申请日期
2009.12.23
申请人
BATHELT, WOLFGANG
发明人
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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