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1927 By Norton abrasive grains abrasive papers Abrasive Wheel alumina Aluminum Oxide Alundum American Steel Foundries artificial abrasives automatic automobile Bakelite bauxite bond Car Wheel Grinding cast iron wheels centers chines chuck corundum cost crystals Crystolon cutting-off wheel cylindrical grinding developed diameter edge efficient electric furnace Emery Wheel engineer factor finish flanges grain and grade grinder grinding action grinding wheel GRJTS and GRJNDS ground hard heat High Speed Steel inch industry information from GRITS kiln Laboratories manufacture material mechanical metal methods minutes motor Niagara Falls Norton Company operation pair of wheels pieces possible privileged to reprint production Railway Refractory Notes reprint any information result revolutions per minute Riley Stoker Corporation sandpaper saving shaft shape shellac Silicon Carbide slid flat steel wheels Surface Grinding Machine T-Bakelite temperature tensile strength tion tread truing U. S. A. Title Reg vitrified wheel face wheel speed wheel spindle Worcester