Ephemera › HS 3866 - Invoice from Colver Brothers, Manufacturers of Steel, Saws, Files and Machine Knives, Pilot Works, Sheffield 1881. Image 1 of 1 HS 3866 - Invoice from Colver Brothers, Manufacturers of Steel, Saws, Files and Machine Knives, Pilot Works, Sheffield 1881. £28.00 Also makers of Paper Makers’ Roller Bars, Plates Ledger Blades and Spiral Cutters. Add To Cart Added! Also makers of Paper Makers’ Roller Bars, Plates Ledger Blades and Spiral Cutters.