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发明名称
LEHRMITTEL FUER DEN RECHENUNTERRICHT.
摘要
申请公布号
DE1824886(U)
申请公布日期
1961.01.12
申请号
DE195900K2986U
申请日期
1959.08.31
申请人
VITUS KNEFELI
发明人
VITUS KNEFELI
分类号
主分类号
代理机构
代理人
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