Marcin Wichary on Twitter: "Mechanical Olivetti Summa 15 calculator from 1949. (Source: https://t.co/TYtaB9L9Me) https://t.co/59UNjjj9ym" / Twitter
![Italian Olivetti Summa 15 handcrank mechanical calculator from the 1950s - Shop L&R Antiques and Curiosa Items for Display - Pinkoi Italian Olivetti Summa 15 handcrank mechanical calculator from the 1950s - Shop L&R Antiques and Curiosa Items for Display - Pinkoi](https://cdn01.pinkoi.com/product/tpYNJBev/1/640x530.jpg)
Italian Olivetti Summa 15 handcrank mechanical calculator from the 1950s - Shop L&R Antiques and Curiosa Items for Display - Pinkoi
Design is fine. History is mine. - Marcello Nizzoli, adding machines: 1/ Olivetti Summa 15, 1949. 2/ Olivetti Multisumma 20, 1964. 3/ Summa Prima 20, 1974. Slow calculators with no stored memory (
![Giovanni Pintori - Original Vintage Midcentury Design Poster - Olivetti Summa 15 Mechanical Machine For Sale at 1stDibs Giovanni Pintori - Original Vintage Midcentury Design Poster - Olivetti Summa 15 Mechanical Machine For Sale at 1stDibs](https://a.1stdibscdn.com/giovanni-pintori-prints-works-on-paper-original-vintage-midcentury-design-poster---olivetti-summa-15-mechanical-machine-for-sale/archivesE/upload/a_436/1523101297406/PA1873_master.jpg)
Giovanni Pintori - Original Vintage Midcentury Design Poster - Olivetti Summa 15 Mechanical Machine For Sale at 1stDibs
![Olivetti Summa 15, progetto Natale Capellaro, design Marcello Nizzoli, 1949 - Museo dell'Informatica Funzionante Olivetti Summa 15, progetto Natale Capellaro, design Marcello Nizzoli, 1949 - Museo dell'Informatica Funzionante](https://museo.freaknet.org/wp-content/uploads/2015/08/Olivetti-Summa-15-progetto-Natale-Capellaro-design-Marcello-Nizzoli-1949.jpg)