GARRETT, Presiding Judge.
By this appeal, appellant seeks review of the decision of the Board of Appeals of the United States Patent Office affirming the holding of the Primary Examiner as to the non-patentability of the following claim:
"18. In the heat treatment of groups of metals consisting of alloy steels and non-ferrous metals requiring treatment at different specific temperature ranges by means of an electric furnace provided with a heat-retentive fused...
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