Olivetti Underwood Electrosumma 22  
Written by Accutron on 2017-03-07  

Introduced in the mid-1950s, The Olivetti Electrosumma 22 is a large desktop adding machine with 12-digit input and a 13-digit readout. The heavy duty print mechanism has four user-settable print wheels to the left of the result field, and can accept paper up to 100mm wide. Olivetti also manufactured another version of the Electrosumma 22, designed to accomodate British currency, with five additional entry keys above the numeric keypad.


Olivetti Underwood Electrosumma 22 heavy duty electric adding machine.


Electrosumma 22, print mechanism.

This article is part of the [Mechanical Calculators] exhibit.

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