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 147,955 pages of information and 233,606 images on early companies, their products and the people who designed and built them.

D Square

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of Swindon

1955 Private company formed as Square D Ltd.

1955 Name changed.

1961 Manufacturers of electrical control gear equipment. 310 employees.

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