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发明名称
Rechenvorrichtung für alle vier Grundrechnungsarten, für die Stellenwertbestimmung und für die Umwandlung von Maßbezeichnungen
摘要
申请公布号
AT164467(B)
申请公布日期
1949.11.10
申请号
ATD164467
申请日期
1948.03.10
申请人
HANS APPELT
发明人
HANS APPELT
分类号
主分类号
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