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发明名称
HILFSMITTEL FUER DEN RECHEN- UND ANSCHAUUNGSUNTERRICHT.
摘要
申请公布号
DE1625789(U)
申请公布日期
1951.07.19
申请号
DE195100K4614U
申请日期
1951.03.14
申请人
WILLY KOEHN
发明人
WILLY KOEHN
分类号
主分类号
代理机构
代理人
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