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1880 Edward Cox-Walker settled in Darlington and established an electrical engineering business in partnership with Mr. Harrison, the firm being known as Harrison, Cox-Walker and Co. It specialized in telephones, electric tell-tales and signalling apparatus for mines.
The firm also manufactured Campbell Swinton instruments for the Equitable Telephone Association, Ltd., and later took up electric lighting and power work.
The business, which became one of the best known in the North of England, was formed into a limited company and was carried on as Cox-Walkers, Ltd.