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1930 Title Reg 3846-K vitrified Blue abrasive abusive grinding abusive heat treatment aircraft motor Alundum aggregates Alundum Refractories Alundum Tubes Automatic roughing Ball Bearing bearings blue by grinding Camshafts carbon chrome steel cast iron chine chrome die steel Cold Rolling Correctly heat treated crank crankpin crankshaft Cylindrical Grinding Machine diameter drawn holes electric furnace Eliminated engine Figure fused alumina grade R2 grains 80 grinder grinding conditions Grinding Machine Division grinding operation grinding wheels Grinds Volume XXI Grits and Grinds hard hardened steels headstock High speed steel horse power Hyde industry iron drum lapping machine tool manufacture marble Metal molybdenum Norton Floors pistons polishing production pyrometer quenching R2 to R8 raceway Radial radial engine resistor roughing and finishing rubber wheels samples shapes Shellac silicate spindle steel pieces surface grinding temperatures tion tungsten chrome U. S. A. Copyright vitrified Blue 0.2 vitrified wheel Volume XXI Number West Rutland wheel face