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Robert Jackson (1807-1873), of Spear and Jackson
1807 Born in Attercliffe, son of Robert and Mary Jackson (Robert was a merchant, in 1846)
1846 Married Caroline Watson in Manchester
1851 Robert Jackson 42, merchant and manufacturer, lived in Ecclesall Bierlow with Caroline Jackson 33 and Caroline R Watson 11
1858, 1859 Master Cutler
1861 Robert Jackson, Etna Steel Works, Sheffield.
1871 Robert Jackson 64, J P, Alderman, steel merchant, lived in Ecclesall Bierlow with Caroline Jackson 59
1872 Patent to Robert Jackson and Joseph Burdekin Jackson, File and Steel Manufacturers, trading under the style or firm of Spear and Jackson, for an invention of "improvements in machinery or apparatus for cutting files."
Of Carrysbrook, in the parish of Sheffield
1873 Died on the 21st of July, 1873. His sole executrix was Caroline Jackson
1873 Obituary 
The decease of Mr. Robert Jackson, senior member of the eminent Sheffield firm of Spear and Jackson, took place on the 21st inst., and has excited considerable regret in business circles, where Mr. Jackson was highly esteemed.
He had been Mayor and Master Cutler, was a J.P., and held other honourable offices.