LENROOT, Associate Judge.
This appeal brings before us for review a decision of the Board of Appeals of the United States Patent Office, affirming that of the Examiner, rejecting all of the claims of appellant's application for lack of invention in view of the cited prior art. The claims here involved are Nos. 1 to 10, inclusive.
Claims 1 and 4 are illustrative, and read as follows:
"1. In a doughnut machine and in combination a cooking vat having...
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