Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,108 pages of information and 233,634 images on early companies, their products and the people who designed and built them.

Citizen Business Machines

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Calculator manufacturer based in Japan.

1974 Added three new calculators to its range. The Private Citizen, 120D, designed for everyday private use. The Business Citizen, 820R, industrial and commercial market with a percentage key and The Scientific Citizen, 820R, with triganometric functions, inverse, logarithms, roots and powers.

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