‎TRONCET‎
‎Arithmographe Troncet. Calculateur mécanique instantané. ‎

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‎Paris, Larousse, (vers 1900).‎

Reference : 18543

‎ Un calculateur mécanique instantané inventé par Louis Troncet vers 1900, utilisant des bandes métalliques et un stylet pour effectuer des calculs. Complet du livret d'instructions et du stylet. Exemplaire en très bon état. /// (16,5 x 12 cm) de 4 pp. Toile rouge de l'éditeur. //// A stylus-driven metal calculator consisting of flat metal bands with notched edges pointing at numbers from one to nine. To be precise, these metal bands are hidden behind seven cane-shaped columns. The user needs to move these bands with the stylus to enter numbers. Complete with instruction booklet and stylus. Copy in very good condition. /// PLUS DE PHOTOS SUR WWW.LATUDE.NET‎

€150.00 (€150.00 )
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