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1852 Alexander Joseph Denial and his brothers Abraham Denial and John Denial were listed in White's General directory as "Denial Brothers, (Alexander, Joseph, Abraham, & John,) steel & file manufacturers, & merchants, Foundling Works, 217 Rockingham street; house: Pye bank". Abraham Denial had been apprenticed to Matthew Dodsworth, knife maker from 1796 to 1803.
1856 'Steel for Dies. — A few months ago, we drew attention to the manufacture of steel for dies by Messrs. Denial Brothers, Foundling Works, for the use of the French Mint. The satisfactory character of the dies so furnished has given rise to another order. The blocks are certainly a beautiful specimen of steel casting, not the least flaw or speck being visible on the bright turned surfaces, even when the eye is assisted by a powerful lens. This is a branch of the steel trades but little cultivated here, and it requires extremely great care during the whole process of manufacture. Hitherto a preference has been given by most governments to a Prussian steel made for the purpose at an enormous cost. Our own Mint is supplied with the Prussian steel. We trust that, as Messrs Denial have been so successful in supplying dies for Paris, orders may be entrusted to them from other quarters, and that they will be able to furnish a superior article much cheaper than the privileged Prussian makers do. We understand that it was from a die of their make that the obverse of the great Council medal was struck for the Hyde Park Exhibition of 1851, as the die of Prussian steel broke under the immense pressure necessary.'
1858 Partnership change. '...the Partnership heretofore subsisting between us the undersigned, Alexander Joseph Denial, Abraham Denial, and John Denial, carrying on business at Sheffield, in the county of York, as Steel Manufacturers, under the style or firm of Denial, Brothers, is this day dissolved by mutual consent, so far as concern the said Abraham Denial...'
1867 Bankruptcy. 'John Denial, of Sheffield, in the county of York, Steel Manufacturer, trading under the name or style of Denial Brothers, having been adjudged bankrupt...