Marcello Nizzoli, adding machines: 1/ Olivetti Summa 15, 1949 2/ Olivetti Multisumma 20, 1964 3/ Su
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 (beside the paper strip). This changed with the introduction of the microchip in the 1970s. Museo de Informática, via Ceres -- source link
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