Olivetti Summa Prima 20

Olivetti Summa Prima 20 is a mechanical calculator or calculator model.

Overview

It is associated with Italy. Catalogue entries for instruments state maker, signature, completeness and working condition. VALÉORINE records this subject so that lots referring to it can be described consistently.

In detail

mechanical calculator

Sources

Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.

reference work · Reputable secondary · Wikipedia
“Olivetti Summa Prima 20”, English Wikipedia, consulted as further reading
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reference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q16583870: Olivetti Summa Prima 20
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