Olivetti Summa Quanta 20 - Wikipedia

Adding machine, 1970s

summap20 Clodoveu Davis

Olivetti - Wikiwand

Olivetti Summa 19 - Wikipedia

Olivetti Summa Quanta 20 Mechanical Adding Machine, Cleaned/Lubricated, Works

Adding machine, 1970s

Olivetti - Wikipedia

Olivetti Summa Prima 20 - Calculator - Computing History

Olivetti Summa Quanta 20 Mechanical Adding Machine, Cleaned/Lubricated, Works

Olivetti Summa Prima 20 vintage mechanical calculator - Catawiki

File:Olivetti summa PRIMA 20.jpg - Wikimedia Commons

Adding machine, 1970s

OLIVETTI SUMMA PRIMA 20 CALCULATOR

Olivetti Summa Quanta 20 - Calculator - Computing History

OLIVETTI - SUMMA QUANTA 20, 1961 - Museo Tecnologicamente