ELECTRIC FURNACES AND OVENS, ELECTRIC HEAT-TREATING FURNACES AND OVENS, AND REAGENT-TREATING RETORTS, FOR CASE-FORMING CARBURIZATION AND FOR PREVENTION OF DECARBURIZATION OF FERROUS METALS, STEELS, AND ALLOYS; AND FOR PARTS AND ACCESSORIES OF AND FOR THE AFORESAID FURNACES, OVENS, AND RETORTS

REAGENTS, REAGENT MIXTURES, OXYGEN-CONTAINING HYDROCARBONS FUSEL OIL, FOR USE IN CARBURIZATION AND PREVENTION OF DECARBURIZATION OF FERROUS METALS, STEELS, AND ALLOYS