Electromechanical calculator companies

Olivetti S.p.A. is an Italian manufacturer of computers, tablets, smartphones, printers and other such business products as calculators and fax machines. Headquartered in Ivrea, in the Metropolitan City of Turin, the company has been owned by TIM S.p.A. since 2003.

American manufacturer of typewriters, and mechanical and electronic calculators

thumb|Brunsviga 15 Mechanical Calculator thumb|Original Odhner-Arithmos-Typ-5