Mechanical 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.

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thumb|On the left, the NEC TK-80 kit, based on Intel 8080 chip; on the centre, Busicom calculator motherboard, based on Intel 4004 chip; and on the right, the Busicom calculator, fully assembled in [[Ueno, Tokyo]]

thumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK

right|thumb|Old brick advert of Facit-Odhner, New York. (Facit-Odhner was a sub-sidiary of Facit) right|thumb|Facit calculating machine, 1954 thumb|upright|Elof Ericsson (1887–1961), founder in 1922 of AB Åtvidabergs Industrier. Photo from 1937. Facit (Facit AB) was an industrial corporation and manufacturer of office products including furniture. It was based in Åtvidaberg, Sweden, and founded in 1922 as AB Åtvidabergs Industrier. Facit AB, a manufacturer of mechanical calculators, was incorporated into the corporation the same year. In 1932, the first ten-digit calculator was manufactured by

American manufacturer of typewriters, and mechanical and electronic calculators

American label manufacturing company

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