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Henry Clayton, Son and Howlett of Atlas Works, Harrow Road, London.
c.1868 Successor to Henry Clayton and Co
1872 Patent to Henry Clayton, Henry Clayton, junior, and Francis Howlett, all of the Atlas Works, Woodfield-road, Harrow-road, Middlesex, for an invention of "improvements in treating peat, and in apparatus employed therein."
1877 Dissolution of the Partnership between Messrs. Henry Clayton and Francis Howlett, under the firm or style of Henry Clayton, Son, and Howlett, as Engineers, Machinists, and Ironfounders, at the Atlas Works, Woodfield-road, Harrow-road, London, W.
1879 Clayton and Howlett of London exhibited "Sturgeon's" high speed air-compressors
Succeeded by Clayton, Howlett and Venables