LENROOT, Judge.
This is an appeal from 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. Claim 13 is illustrative of the question involved, and reads as follows:
"13. In a mechanical dishwasher, a vat having an outlet in its bottom, a stand pipe connected to the outlet and provided with an over-flow passage some distance above the level of the outlet...
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