Cryogenically-treated metal brake parts for land vehicles tempered with liquid nitrogen or other cryogenic fluid, namely, brake rotors

Treatment of materials by means of cryogenic processing, namely, cryogenic treatment of metal brake parts for land vehicles tempered with liquid nitrogen or other cryogenic fluid, namely, brake rotors, brake drums and brake bearings; treatment of materials, namely, gun barrels and power-operated machine tools in the nature of drills, routers, bearing inserts for machines, inserts for power-operated tools in the nature of drills and routers, broaches, circular saws, band saws, dies for use with machine tools and die punching machines by means of cryogenic processing