![1964 Olivetti multisumma 20 running without body | made in Italy | electromechanical calculator - YouTube 1964 Olivetti multisumma 20 running without body | made in Italy | electromechanical calculator - YouTube](https://i.ytimg.com/vi/Sxe3GdxsfYI/hqdefault.jpg)
1964 Olivetti multisumma 20 running without body | made in Italy | electromechanical calculator - YouTube
![Olivetti Summa 15 Vintage Mechanical Calculator. Serviced and Working. Great Decoration for Desk and Office, Beautiful Design. - Etsy Olivetti Summa 15 Vintage Mechanical Calculator. Serviced and Working. Great Decoration for Desk and Office, Beautiful Design. - Etsy](https://i.etsystatic.com/24061700/r/il/66e7ed/5557773289/il_fullxfull.5557773289_h6ty.jpg)
Olivetti Summa 15 Vintage Mechanical Calculator. Serviced and Working. Great Decoration for Desk and Office, Beautiful Design. - Etsy
![The Olivetti Summa 19: the last mechanical calculator - Italian Ways | Tech design, Design classes, Memphis design The Olivetti Summa 19: the last mechanical calculator - Italian Ways | Tech design, Design classes, Memphis design](https://i.pinimg.com/736x/3d/33/2c/3d332c6efe21e0ca8d6f547761d088f1.jpg)
The Olivetti Summa 19: the last mechanical calculator - Italian Ways | Tech design, Design classes, Memphis design
![File:Calcolatrice elettromeccanica, da tavolo - Museo scienza tecnologia Milano 12942.jpg - Wikimedia Commons File:Calcolatrice elettromeccanica, da tavolo - Museo scienza tecnologia Milano 12942.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/6/66/Calcolatrice_elettromeccanica%2C_da_tavolo_-_Museo_scienza_tecnologia_Milano_12942.jpg)