| 发明名称 |
A vocabulary learning aid with a first and second mutually displaceable covering elements useful in learning foreign language vocabularies |
| 摘要 |
<p>A vocabulary learning aid with a first covering element (5) and a second one (6) which can be displaced relative to the first one and is connected to it.</p> |
| 申请公布号 |
DE202004018465(U1) |
申请公布日期 |
2005.01.20 |
| 申请号 |
DE20042018465U |
申请日期 |
2004.11.29 |
| 申请人 |
KLINGBERG, STEFAN;REITER, ANDREAS |
发明人 |
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| 分类号 |
G09B19/04;G09B19/06;(IPC1-7):G09B3/00 |
主分类号 |
G09B19/04 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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