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Die große Enzyklopädie des mechanischen Rechnens

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Patent:IT385246


Patent:IT 385246
Title:Dispositivo di doppia totalizzazione per macchine addizionatrici o simili
Date:18.02.1941
Place:Milano
Country:Italy
Person:Bona, Osvaldo
Company:Aldo Bona (P)
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 IT385246


Presented to Italian Patent Office: 31/August/1940
Reference: Bollettino dei Brevetti (part I, section X), 1941