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发明名称
Rechengerät für Anschauungsunterricht
摘要
申请公布号
AT209078(B)
申请公布日期
1960.05.10
申请号
AT19580008883
申请日期
1958.12.23
申请人
VITUS KNEFELI
发明人
VITUS KNEFELI
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