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Sir Joseph Whitworth's adaptation of Bessemer's principle of hydraulic pressure casting was patented in 1874. The first Purdey Pair Nos. 10614 & 10615 were delivered January 1, 1880 with the "New Whitworth Fluid Pressed Steel". Lefever Arms Co. offered Whitworth steel for the Optimus in 1887, but Hunter Arms did not for the Smith Monogram, A2, and A3 until 1895.