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of Helsby, Near Warrington
1879 Joseph Slater Lewis started in business as an electrical engineer at Helsby
1880 Lewis invented a self-binding insulator which was widely adopted in Europe and the United States.
Lewis began to manufacture his insulator on a small scale.
Other branches of electrical work were later included in the business.
Eventually this business, together with an insulated wire factory, in the neighbourhood, was incorporated as the Telegraph Manufacturing Co.
Late 1880s was one of the contractors for the installation of the new telephone service in Manchester