Calculator, mechanical, hand operated by 2 levers, rectangular, metal case, dark green/grey finish, adds, divides and multiplies, 'Facit', Atvidaberg-Facit, Sweden, 1950s (OF).

Swedish maker of calculators and adding machines, 20th century

The "Facit" company was established in Stockholm in 1918 to build a line of pin-wheel calculators based on the Odhner mechanism.
In 1924 Facit became part of Atvidaberg Industries, a long-established firm of office furniture and equipment suppliers. Facit production moved to Atvidaberg, and the model range developed rapidly. As the firm grew it absorbed the Halda typewriter company in 1938, Original-Odhner in 1942, and Addo in 1966. At its peak the company had over a thousand employees, with sales agents in a hundred countries, before collapsing in the early 1970s.
The early Facit calculators were similar to the Odhner, with rotary setting levers and a moving carriage which extended beyond the body of the machine. In the early 1930s engineer Karl Rudin made a radical design change which retained the pin-wheel principle but eliminated the external moving carriage. The pin-wheel mechanism was effectively turned upside-down, with the accumulator and counter registers being fixed in position at the top of the machine, and the rotor arranged to travel laterally within the confines of the body. At the same time, the rotary setting levers were replaced with the two-row "Dalton" keyboard mechanism. The operating levers and the cranking handle were the only external moving parts.
This "inverted" pin-wheel mechanism formed the basis of the Facit model range for the next 40 years. Beginning with the Model T in 9 x 8 x 13 format in 1932, the machine progressed through the Model TK (1936) and the NTK (1954) to the C1-13 of 1957, which continued with only minor changes into the early 1970s. The same mechanism formed the basis of the first motor-driven range, which progressed through several models into the fully-automatic CA1-13 of 1956. A 16-digit mechanism with back-transfer and a 10-key numeric keypad was introduced as the manual Model CM2-16 in 1959. The fully-automatic CA2-16 followed in 1962, with an updated Model 10-07 in 1967. The 13 and 16-digit mechanisms were both manufactured in parallel until the end of production in about 1973.
In 1966 Facit introduced the first of a range of electronic calculators manufactured by Sharp in Japan. The Facit machines had their own distinctive case designs, but the internals were generally similar or identical to the machines sold under Sharp's own brand. The electronic machines were sold in parallel with Facit's traditional mechanical calculators, but were initially much more expensive. The prices reached parity in about 1972, which effectively marked the end of mechanical calculator production.
Sourced at http://johnwolff.id.au/calculators/Facit/Facit.htm, accessed 21/10/2021

Atvidaberg-Facit

Sweden, Europe

The science that deals with the measurement, properties and relations of quantities.  Use this term for all branches of mathematics including arithmetic, geometry, algebra, etc.

Mathematics

Swedish design

Subject area covering the design of products.

Product design

K452 Calculator, mechanical, 'Facit', metal / glass / plastic, Atvidaberg-Facit, Sweden, 1950s

Calculators operating by mechanical activity, usually consisting of identical columns of numeral selection keys. The numerical value is selected by depressing keys and the result is displayed in a mechanical accumulator register.

POWERHOUSE COLLECTION

Facit model calculator made in Sweden

Object No. K452

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