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of Belle Vue Mills, Skipton
of Valley Mills, Elland, Yorks, as part of the Ingham, Dewhurst, Illingworth Group. Telephone: Elland 2401-2. Cables: "Dewhirst, Elland"
 By 1821 Scalegill Mill, in Kirkby Malham, had been taken by John Dewhurst and Co of Skipton.
John and Isaac Dewhurst invested money in equipment, making it an important production unit.
1825 Their insurance policy valued the company as: Scalegill Cotton Mill £800; Mill Work £300; Machinery £1,500; Stock £25; Panhouse adjoining £15; Stock therein £10; Stable, Warehouse and Counting House £50; Stock therein £300;
Dewhurst’s became famous for their sewing cotton, marketed under the Dewhurst Sylko. brand.
1834 They later also ran the mill at Airton, which they leased in 1834.
1838 Isaac Dewhurst was still running the Scalegill mill.
1839 He was granted a further 9 year lease by William Rookes Leedes Serjeantson on 12 May, at £128 per annum.
When Dewhurst's lease ran out, they evidently did not want to renew it again and the mill was again advertised for rent.
1947 British Industries Fair Advert for 'The World's Best Worsted Yarns from Yorkshire'. Manufacturers of the following Branded Knitting Wools, "Valleydew", "Rippledew", "Rocdew", "Purldew", "Lozeydew", "Shimmerdew", High Class Botany Yarns in either White or Coloured, Spun on the English or Continental Systems. (Textiles Section - Earls Court, Ground Floor, Stand No. 166)