GARRETT, Chief Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the Primary Examiner's rejection, as unpatentable over the cited prior art, of the only claim in appellant's application for patent reading:
"19. A brake lining, the coefficient of friction of which shows an increase at the beginning of its use and retains its increased value during prolonged use, consisting essentially of a heat-and...
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